We did HDDR last August. My dd, 11, has wanted to give it a try for quite awhile now. Our feeling is this....the food was okay. My dh isn't really a rib lover or chicken. And he really dislikes baked beans. That left him with little to eat but he made do. I really have no big issue with the food. It's pretty standard Disney fare. The show is really cute but corney. It is a typical ole west stage show. It was fun, even for the adults. I would think that being handicapped wouldn't pose a big problem. But, to be honest, that isn't something I paid attention to.
You do need to make PS for this show as soon as you know you are going. I just booked it for Oct '06 for my dd's 13th birthday. You are seated according to when you book.
So, our feelings are this....my dh doesn't care if he ever does it again...I think it's okay and fun, but maybe not for every trip. But, there are others who do this every single trip. So, there are a lot of different opinions here.