Hey! this is a really interesting topic! If you and your survey subjects feel comfortable, you should post back with some anonymous and very generalised comments about how disabled people feel they are treated. It would be an eye opener!
I just thought I'd mention it because I read an article once about a disabled woman in a supermarket who was waiting in a queue behind a mother and her son (who was very young, I think) and he turned around and said "Mummy, what's wrong with that lady?" and the mum went bright red and scolded him very loudly about how it's rude to say things about disabled people. The disabled woman said it made her feel really bad, because she would have rathered the mother explain to her son that she was disabled and some people just are, instead of treating her disability like an embarrassment. I thought this was an interesting comment and one I had never thought about. I suppose everyone is different, but it got me thinking about how being too PC actually reinforces the fact that someone is different to you (in any situation - disability, race, sex, religion, build, looks...).