With a AAA package, you also get a Diamond Card which is good for discounts at many places. Among them are: World of Disney, Disney tours, some DTD restaraunts, mini-golf, mouseboats, Grand Floridian/ Saratoga Springs spa services, and a bunch of others. You also get a parking pass for the Diamond lot which is supposedly right behind the handicapped spaces at the parks.
We also got a voucher to attend a character storytelling as well as a merchandise voucher good for either a clock or photo memory box (not sure what these are yet).
Overall, I saved close to $200 on our 9 day trip later this month with the AAA discount (we got the dining package too). Combined with the above mentioned discounts which we will use several of, it was worth it to me.