I agree that it may not be worth getting AAA just for the disney discounts, but (even if you don't have a car) there are other discounts. For example, today I went up to find out disney tix prices and while I was there, I bought dicounted tickets for the movie we are going to tonight ($6.50 instead of $8.75 times 4 tickets). Also, most hotels have a AAA discount that can be substantial. THey also have a prescription discount that I will be looking into since our health insurance no longer covers that. Plus all kinds of random store discount that I didn't know about before I got a brochure today (ie, Payless, Barnes and Noble, etc)
As far as car services -- so far on this year's membership I have called them twice for a dead battery, 5 times for locking my keys in my car (DH only knows about 1 of those! I'm notorious for that.), once to be towed after my car was hit. Once for Trip-tiks (customized maps). So, I more than got my AAA plus membership fee's worth.