Originally, I asked for a quote through AAA's website. When I did, I was given a quote from an assigned AAA TA. From that point on, all of my dealings were via e-mail and phone with only that AAA TA.
Based on my dealings, I can guarantee you that Disney has your reservation in their system. At one point, I asked for my Disney confirmation # as it appeared that the number on the confirmation that I received from AAA was not the Disney #. My TA informed me that it was the only # that Disney gave to her. That leads me to believe that Disney has everything in their system.
In another correspondence, I asked my AAA TA about making room requests (In my case, I wanted to request the AB section of POR). She said that she would have to put that on the reservation. I still plan on calling/faxing POR directly the week before I arrive with more specific requests (non-smoking/building preference).
The only thing that I can not comment on is the success of this as my trip is not until October. Hope that helps.
ETA: When I made my initial deposit through my AAA TA, I was asked if I was a AAA member. I responded that I had just ordered my membership, but had not received my card yet. She said that was fine, but make sure I had it for check-in. Since then I have made my final payment and still have not been asked for my membership #.