Get Your Disability Service (DAS) Pass
Disney has changed their disability services plan over the past few years. Where it used to be you could skip to the front of most lines, you now have to get a Disability Service Pass that serves almost as another FastPass. You take that pass and go to the kiosk at the front of each ride, and they then provide you with a return time based on how long the line currently is. When you return, you're then able to go through the FastPass line.
While you can only be queued up for one line at a time, you can still use your regular FastPasses as well. And you can ride other rides, or eat meals, while you wait for your return time.
It may sound complicated, but once you get a feel for how it works, it's actually pretty easy . . . and can save hours in line, something that means a lot to those of us with kids who simply can't do more than a few hours a day at the parks to begin with.
You can get your DAS pass at the guest services building in any of the parks. Ours took minutes to obtain — I simply had to explain what my daughter's limitations were, and they happily gave us what we needed. And once you have your pass, you can use it at any of the parks for the rest of your trip.
One important reminder: make sure everyone from your party is with you when you obtain the pass, so that you can all ride together.