I'm a member of AAA and have let them bid out a WDW vacation package three or four times (including this year), and in all those instances, they've never been able to beat what I can reserve online myself directly with Disney.
The caveat I'd offer about AAA is that, despite their national organization, individual/regional AAA's operate with a good deal of autonomy. So when you hear that AAA from, say, Ohio is offering deal x, there's no guarantee that
your AAA will get the identical deal,
unless you
specifically know the deal is a national offering. You might get it. You might not.
Additionally, the local AAA reps, while very nice, aren't always equally trained. I lost a lot of faith in them when we were going to buy park tickets through them at a local office for a vacation a few years ago, but
none of them - mind you,
none - could operate the ticketing system.
Two different staffers tried for literally
an hour arguing with the computer, and they finally gave up, saying, "well, our normal Disney person isn't here right now, could you come back tomorrow?" Only thing was the AAA office was on the other side of town from us, had business hours that ended about 4pm, and I had taken a day off specifically to finish vacation details and didn't have the option of "coming back tomorrow" just because it was more convenient for them. I was taking advantage of AAA's promise that I could "come in and buy your tickets anytime." Not so much. And this wasn't some small, hole in the wall office - it was a large, main office serving the whole city.
We ended up going to a
Disney store on the far north side of town and bought tickets from them - it was amazing: we were in and out in about ten minutes. We lost the half-percent (or whatever) discount AAA offered, but the aggravation factor more than made up for it.
This year, I thought AAA was going to get us a great deal - what amounted to
an additional day at the same package price I'd booked directly, until a subsequent email exchange led her to tell me "oh, sorry, I punched in the dates wrong, its really $xx," which was exactly what I'd already booked. No savings. I was just thankful I hadn't cancelled the other reservation.
While I realize those were probably exceptional cases, and I'm certainly not saying never to use AAA, I am advising caution. These days, I keep an AAA card solely for hotel discounts en route, or emergency road service (heaven forbid I need it). I've kinda given up on their Disney offering.