OK, I'll add what I can.
As Cheshire said, the Guest Assistance Card (GAC) allows you a number of accommodations to help compensate for disabilities. It can be stamped with different messages, depending on your needs. Probably one of the main messages you'd need would be 'stroller as wheelchair'. This means that Cast Members will treat his stroller as a wheelchair, so he will be allowed to use in in lines, buildings such as the Land and will be granted access to the wheelchair viewing areas for parades and shows.
Most rides and attractions now have 'mainstream queuing'. This means that wheelchairs go all or most of the way through the regular queue, before boarding. Often you will have to go to a different area to board (normally the ride exit) to allow you more time to get on and to make sure the wheelchair is there when the ride finishes. As you're such a large group, you may not be allowed to all stay together to go to the wheelchair boarding area (they normally only allow 5 people plus the wheelchair user). However, as the majority of your party are children, and you're only one person over the numbers, they may make an exception.
To find out where you go with a wheelchair for each attraction, just look for the wheelchair symbol or ask the Cast Member at the entrance to the ride. You can also pick up the Guide for Guests with Disabilities at Guest Relations (the same place you go for the GAC).
For changing, if it is difficult for you to use the regular changing table in the restrooms, they have areas in the First Aid rooms suitable for changing older children and adults. There is one First Aid Centre in each park, and they are marked on the regular park map with a white cross on a blue background. You can also use these centres to rest in if you need. They have beds which guests can use for a short lie down in the air-con.
I'd suggest you do as much planning as possible before you go. However, I wouldn't recommend having a rigid timetable, as things crop up, especially when travelling with someone with a disability. If you get copies of the park maps (either from the
DIS maps page or you can get them sent to you through the official WDW webpage) and get everyone in the family to list their 'must do' attractions. That way, even if you don't manage to see everything the parks have to offer, no one in the family feels that they've missed out.
Does he get overcome sometimes because of his sensory issues? If so, you might want to look up some of the recent threads on autism, as some of the 'coping strategies' may help you guys too. In particular, if he has issues with noise, you might want to look at getting him some ear defenders, to block out some of the noises.
When booking your hotel, if you have any needs such as 'close to food court' or 'ground floor' (probably not necessary, as I think all the value resorts have elevators in every building), make sure they are listed on your reservation as 'for medical reasons'.
If you've not booked yet, another option you could look into is renting a Disney Vacation Club room from the DVC boards. They have a variety of studios and villas available for different amounts of points, but all have a kitchen or kitchenette. Members who have points that they will not use, sometimes rent them to other people for a fee (normally between $10 to $12 a point, though it does vary). There is an element of risk involved, as you are renting from an individual, not from Disney. It might be worth you looking into though. Check out the
DVC boards, their
tips for renting and the
point calculator for more information. Oh yes, and Old Key West is the cheapest point rental resort.
Hope this helps! I'll probably think of more things to say soon, which I will post up as and when. No doubt you'll come up with a whole host of questions soon as well, which we'll do our best to answer.
Have a wonderful trip!
