This thread offers some good information on Disney World related AAA benefits.
http://www.disboards.com/showthread.php?t=2421734&highlight=aaa
You usually save around $5 per ticket for Disney World through AAA. Last year we bought two 6 day Disney base tickets and two 2 day hoppers for Universal. We saved around $50 over gate prices, but most of the savings came from Universal. So, some attractions have bigger savings and some have measley $1 or $2 savings. (For Disney,
Undercover Tourist actually has a better deal.)
Other than Disney World, if you go to your local AAA website or office, you can get discounts on other attractions like aquariums, movies, zoos, and other theme parks.
Yes, you can get discounts of around 10%-15% on hotels through AAA, but honestly you can find better discounts other ways. Bookit, hotels.com, etc. In addition, most hotels offer a discount for booking online in advance, and this discount is usually equal to or better than AAA. (In this case, the only possible downfall is that these advance bookings are usually non-refundable.)
The best AAA benefits in my opinion are the road-side services they offer. I can't count on one hand how many times my boyfriend has just called them up if he was in an accident or needed a tow for any reason. They showed up quickly for no extra charge and took care of whatever he needed.