Just a clarification, the fast pass and the disabled pass are two different things, so make sure you go to guest services and get the disability or VIP pass. This pass has no restrictions on how many times you can go on a ride.

Disney is very disability friendly. The GAP passes are a must. Lines are loud and busy. The passes will allow you to avoid alot of the over stimulation of a line that might keep your family off of a ride that they would be otherwise comfortable with.

Crowds and noise were my sons big bother at Disneyland. We switched up our day when we went there one time when he did not even make it throuh the main gates. Luckily, Downtown Disney has great stores and places to eat and shop where the Disney experience was fun for him but sooooo turned down.

All of the "cast members" were super to my son when they saw he was distressed. It is the Happiest Place...

Just plan on an "open schedule" and the day will be aces. Have a super time. It is my favorite place.

You've got some great advice. We went to Disney World last summer. I would say that what you need depends on your child's sensitivities/specific issues. In general I would say:
1. Definitely go to Guest Relations and get the disabled pass. We got one the first day, but since our daughter does have some ability to wait in lines, we never used it. But it's nice to have if you need it.
2. Make plans for what you're going to ride, and as much as possible let him make some of the decisions about what he wants to ride. I showed my kids videos of the different rides on youtube, and that worked great. My daughter is particularly sensitive to anything she deems "scary" (which can be almost anything), so letting her watch the ride ahead of time was great.
3. Take a break and go back to your hotel/wherever you're staying for at least an hour or two in the middle of the day. Disneyland is smaller so judge this accordingly, but it was vital for us.
4. One thing that few people know about- There are Baby Centers for parents with babies in every park in Disney World, so I suspect there's at least one in Disneyland. Basically it's a small set of rooms where there's some restrooms, highchairs, small tables, rocking chairs, and baby food and diapers for sale. My youngest was 10 months old, which is why we discovered this, but it ended up being even more helpful to my daughter with autism. It was a place to take a break but not leave the park. It was a quiet, non-stimulating environment, an empty bathroom, etc. There were times during our trip that she actually asked to go there instead of going on rides. I've read that with the GAP (guest assistance/disability pass) they can customize what you're "allowed" to do based on your child's needs, so if you're interested in checking out the baby center as a possible rest area, you may want to ask guest relations if you can have permission to take your child there.

Yes you can go to guest services and tell them your situation, they will give you passes no questions asked. This will allow you to bypass the lines so you do not have to wait. You go into another entrance and go to the top of the line, it worked great for us. The other advice I would have is to not try to do to much, and let the kids kind of dictate how long they are comfortable with staying. I know it is hard because you want to see everything, but the truth is that the parks are way to big to see everything anyway so just keep it short and sweet.

We just came back from Disney World. The only thing I could do was just take it minute by minute and let her lead. I also gave her choices so she felt she had more control. We had moments if meltdowns and handled them immediately by placing her in timeout right then and there. Overall, I thought she did really well. I also brought snack crackers as it seems that she gets nervous everytime we were in line and would get an upset stomach. As for the lines, you are only allowed to use the "fast pass" once for each ride that offers them so we picked carefully and did it with the more popular rides and rides that were longer wait times.