When I went to pick up my AP last summer, there was definitely a bit of a wait. It was fairly crowded, but I think your time waiting depends on what kind of service your getting. Since I was just using my tickets to purchase n AP, the wait was terribly long.
The good thing is, its a nice building. Cool inside, with water and comfortable chairs. A cast member puts you on a waiting list, so you just have to listen for your name being called. But if you are trying to get something done quickly, you may need to strategize more.