For our trip a few years ago, I just went to the AAA website and got a quote from a "live" chat with one of their planners. It was quick and painless. We did save quite a bit, but a code came out that saved us more. AAA was able to use that code for us with no AAA discount.
We pay roughly $69 a year for AAA and we use it for alot of things. Discount tickets at other places and the roadside service has saved us a few times. Last halloween a few teens went around the neighborhood slashing tires. They came right out and towed us to the tire shop. Both cars. So, even if you can't get a good discount with your disney trip with AAA, there are so many other advantages that I would factor in in the cost per year.
Kelly