The Make a Wish type pass is a one time, once in a lifetime situation, given to kids on their WISH trip. It is
not something available on future trips.
Recently, even people on Make a Wish trips have said that they did
not necessarily get a pass that allowed them to bypass lines. Instead, they were asked about their child's needs and were given a GAC (Guest Assistance Card) based on those needs.
The Make a Wish types of passes are not given out to former MAW kids on future trips. The CMs (Cast Members) at Guest Relations at the parks are the only ones who can issue Guest Assistance cards, so anything that you are told on the phone or in email is not necessarily going to be what happens when you get there.
The disABILITIES FAQs thread has a section about GACs that should be helpful to you. Be prepared to explain your child's needs and they will try to accomodate them. You will not, though, get the same pass as MAW.
Fastpass is a good way to avoid long waits in line. It is available free of charge to everyone.
There are times of the year when the parks are not as busy and you will not find long lines. Typically, January is a slow time, but there are many other slow times during the year.
Even during the busiest times (like Spring break and Easter), you can find short waits
if you know where to be and when.
Some things (like Spaceship Earth, Dinosaur at AK, the Safari at AK, etc ) have a crowd and a long wait early in the day, but if you go later in the afternoon, you can walk right in and ride without a wait. For example, when we were at WDW this year during Spring break, we went on Kali River Rapids thru the regular line and got on pretty much as fast as we were able to walk.
If you are staying at one of the WDW resorts,
Extra Magic Hours (EMHs) are a great way to see things without a long line. My oldest DD , my niece and I went to the evening EMHs at Epcot. We were able to go on Mission Space without any wait at all (could have gone on as many times as we wanted) and we actually went on Soarin' 4 times - got off, got right back into line, and got back on again as fast as it was possible to get thru the distance.
Another service that a lot of people have had good luck with is
Tour Guide Mike (a Theme Park Board Sponsor). The owner of that company worked for Disney as a VIP tour guide. He had to know what was busy and when so he could steer his guests away from those things and toward the ones that were not busy. Knowing those things can make a big difference in your wait times.