I have been an AAA member since I got my first car (thanks mom & dad!) and I wouldn't be without it. I've used them for towing, jump starts, maps, tour books, discounted disney tickets, discounted hotel rooms, and probably other stuff that I can't think of
Oh, movie tickets and dry cleaning!
I have DC too, and it got us a discount on our annual passes. I don't think there is any other AP discount available. Origianlly I had the DC discount for my rooms but got a better rate later on. The DC rate was the same as AAA. I've saved about $10 at the
disney store this year. I don't shop there often but they had some great sales recently! We plan to use it in WDW for discounts at swan/dolphin restaurants and the rain forest cafe.
Oh, and the Disney club rate at national car rental was the cheapest I could find by far! We have $207 for a full size car for 11 days.
Definitely go with AAA and think about DC.