First, I find it interesting that so far, in spite of your asking only those that are spectrum to answer, there are several responses already from those who are not.
Now...
"Personality" trait? Well, let's see what the definition of "personality" is... from Merriam-Webster: a: the complex of characteristics that distinguishes an individual or a nation or group; especially : the totality of an individual's behavioral and emotional characteristics b: a set of distinctive traits and characteristics .
Autism is a way of behaving, a set of characteristics of personality (perseveration/intense focus, passion for details, sensitivity to physical environment, comfort in structure, etc.).
Yes, there is an inability to understand social subtlety, and a preference for reduced social stimuation. Yes, there are sensory filter issues that mean that an autistic gets easily overwhelmed by stimuli that others would not even perceive.
Although many people think that autism-spectrum people lack empathy, that's not true. It is just that modeling of how to respond to people's feelings took an ugly turn early on... the autistic was corrected rather than comforted in an autism-positive way (e.g. left alone with acceptance) when overwhelmed, punished rather than given a reduction in environmental stimulation when sad or angry... all because he or she was wired to show those feelings differently than "normal," and the unfortunate thing is that an NT (neurological typical) DYSFUNCTION is to perceive honest autism expression of feelings as annoying, confrontational, etc.; and to think that such expressions from one person mean the same thing as what they feel when they show that behavior. I confused the heck out of my colleagues at work when I bounced up and down the hallway smiling when my mother died. I smile and bounce when I'm sad. I cry when I'm frustrated or angry. I cried later when I hit the angry point in the grief cycle. When my son saw me smiling that day, he said "Yeah, I'm sad that Oma died, too." Yes, I also smile and laugh when I think something is funny or I'm happy.
Using your analogy of a blind person, just as a blind person has heightened senses of hearing, touch, etc., someone who has autism spectrum blindness to social subtleties has heightened skills in other areas. Those of us that are extremely "high functioning" autism spectrum (I am diagnosed NVLD/Aspergers), have great strengths for time and space details and structure that neurologically typical people tend not to have. Our analytical skills in certain areas are heightened. Many of us go into the sciences and mathematics for just that reason.
Those that are "lower functioning" usually have "comorbid" conditions (OCD, ADHD, SLD, MR, and/or etc.) that cause additional symptoms and lack of ability to function. The actual autism is the least of their problems, even if from an NT (neurological typical) perspective their primary categorization is autistic.
Yes, there are "symptoms" that are a royal bother for us, and for the people around us. However, if you go to an autism convention, you will find that most higher-functioning autistics get along as well as a crowd of NTs do, with each other... and respect each others' need for space, for sharing "I statements" to show agreement, etc. We are perfectly well able to communicate... just in a different fashion than NTs. Just as the blind use Braille, and the deaf use sign language, we use words for their literal meanings, and don't rely on social posturing. For many of us, lying is horribly uncomfortable, physically painful, or downright impossible. Things taken as "lying" by NTs really are misperception of environment or wrong conclusions... but a firm belief in those conclusions until the evidence can be re-presented.
My son, age 13, is also diagnosed Aspergers. He participates in the high school drama club (which, with the right teacher, is a magnificent tool to help autism-spectrum teens shape more socially acceptable behaviors by creating different stage characters and applying that "faking" ability to "real life"). He is really good friends there with a PDD-NOS student in 10th grade. They get along great, and spend a lot of time laughing... even though nobody else at rehearsal gets their communication at all (I do, but then I'm spectrum).
Those who are spectrum who hate it do so because of the pain inflicted by neurological typicals (NTs)...horrible rejection, teasing, and even physical violence. We learn at an early age that no matter how "good" we are, we can never tell if or when we do something that makes someone mad at us. Many of us end up with psychiatric levels of anxiety, depression, or even dissociative disorders because of both chronic bullying, and well-intentioned "correction" that amounts to abuse. Blind people are not punished by the authority figures around them for not being able to read print or see the pretty sunset, or for running into someone on accident, nor is any other "disability" group so unpredictably and inexplicably punished when they are failing at something due to their "disability." For all other "disability" groups, that form of "correction" faded with the advent of modern science. Yet for some reason, so many still perceive autism something the person willfully does... partly because NT kids show outwardly similar behaviors for totally different, socially manipulative motivations. NTs "mirror," and only perceive what they see in that "mirror." It is rare to find an NT who can understand how autistics have individual motivations and different behaviors to show them.
Speaking of behaviors, ABA programming is essentially like the drama club... teaching the autistic to put on an NT-accepted persona to gain rewards and avoid punishment. Good ABA programming also takes autistic sensory, social, etc. needs into consideration (e.g. a quiet room, people trained to respect the autistic's personal space...even if it has a 10 foot radius, etc.). Survival behaviors are graudally shaped rather than forced. Unfortunately, I've had the chance to network with enough adult autistics who were in "ABA" programs that were not run correctly. It is frightening what they went through.
NT communication is riddled with surface fallacy that is actually representative of different, almost unrelated meaning dependent on environment, who is present, what social situation and social position each person present holds, etc. NTs ability to perceive the layering, shifting meaning, and double meanings comes "naturally" because early childhood perceptual abilities in this area were present, and practice was honed from infancy.
Autism-spectrum people have the SAME detail perception ability, but SHIFTED to physical world, time, analytical logic (e.g. mathematics), etc. That shift is a gift, and the source of such things as this very PC or Mac you are using today.
Words mean what they mean, and you use them to communicate in that way... double meanings are confusing and unnecessary, except that NTs value social posturing above the truth content of the words. Yahoo just had an article up on their front page about how among NTs gossip is believed, even with physical evidence right in front of the people that the gossip is false. This is incomprehensible to autism-spectrum people.
Do I want to be cured? NO!!! My heightened perceptions and reasoning abilities have enabled me to work effectively as a special education teacher, with very positive results with my students, although I struggle with interaction with adult staff members. I have very little trouble with parents, because they love the results I get with their kids, and because teacher-parent interaction is predictable so I can rehearse NT social body posturing and phrasing for the dialogue ahead of time (remember the drama club thing?).
Do I feel like I wish the difficulties associated with being AS would go away, that I could maintain NT friendships without fear of unpredictably, inexplicably offending my friend and losing them without ever really knowing why they got mad? Heck, yes.
Do I feel like less of a person because of difficulties interacting with NTs? No.
Would I give up the AS knowing that my strengths would be reduced... NO!
A cure is not needed... a bridge is. There is a university researcher in Cork, Ireland, who is doing her dissertation on seeking to find common ground on which to align NT and spectrum communication modalities. Brava!
The source links are the dictionary definition I used at the beginning, and the other three I think you will find fascinating.