I went in October/November of last year. There was little to no wait to see him. It was very cool. I did have a fast pass one time but the regular line was very short/just a couple of people. We went back because I did not have my video camera on me the first time and I did not know he was going to talk.
It was really cool. He has a special backstage dressing room and my 4 year old Daughter really felt like she was meeting the real Mickey Mouse. It is also has a very small personal feel because just a handful of people are in the room at one time so you feel like you are being invited backstage to meet the mouse!

Oh and I think the location of the town hall makes it so people just kind of run past it and many do not come running back to meet mickey. I am sure it has to do with time of day as well. We went late afternoon and then early evening. One day after meeting him we were eating at Tony's and it was kinda like heh, you want to check out Mickey again (because the line was so short).