I guess I have to be the only dissenter here. I had my AAA agent quote some packages for me and I went online with Disney and directly with the airlines and found that I could get a better deal doing it online myself. There was a significant difference with the airfare. Plus, I was able to book better departing times.
I like AAA and have used it for travel books and road service and will continue to use them for that stuff. However, I probably won't use them for booking trips.