We were at WDW 2 weeks ago. Aswe went into Epcot my daughter (In a power w/c) wa chattering away to some CMs. One drew her a picture of Mickey and the other went and got a little certificate for visiting Epcot. She was telling them how she was going to see Mickey, etc.
One of the CMs walked us to the character meet place (I forget the building, but there is a building in Epcot with most of the mickey-esque characters). Anyway she told the CM she wanted Julia to go on and see the characters. The CM was taken aback I think she asked for our GAC. I didn't have it my husband had it and he was still outside. So I went to get it from him and evidently the 2 CMs had a rather heated discussion..... When I handed the girl the GAC (as if the w/c isn't clear) she said "They would have gone on in anyway with their GAC". So the first CM told us to enjoy our day and said her fairwells to Julia and exited.....
The line in that particular building would not have fit Julias chair. It was rather narrow. So in that specific location the GAC was totally appropriate.
As for the WC.... I think some just don't undertand. Its like they think its a little go-kart for fun. *shrug*....
Good luck and enjoy your trip!