We have been in all 3 when there were people using a GAC without a mobility device in those areas with us (our DD is a wheelchair user).
The people we saw without mobility devices (stroller as wheelchair,
ECV or wheelchair) appeared to be using the area to avoid being close to other guests.
I can see situations when they may say GACs are not used there.
Tiki Room - the first row of the waiting area is used for guests with mobility devices and special needs. It is fairly long, but also narrow and can get filled. Depending on the number of guests waiting there, there may not be room for guests who could possibly wait somewhere else.
And, in most cases for Tiki Birds, the wait will be for the next show, so less thn 10 minutes
Country Bears - the waiting area used for guests with mobility devices and special needs is to the left. It is sort of square and looks quite large, but we have been there when the area was really packed with parties including someone using a mobility device.
The regular waiting area is quite large and it is possible to find a place to wait there where you would be a bit separated from other guests.
And, the wait there is usually for the next show, so less than 10 minutes.
Laugh Floor - when we were there in October 2012 and March 2013, they did not separate out guests with mobility devices and other special needs until the last room before going into the show. This was different than before, when the 'handicapped path' began at the entrance door and continued parallel to the regular line all the way to the show.
Again, the area is long, but quite narrow. The door to that line open up slightly before the main doors (to give CMs time to seat guests waiting in that area before the main doors open). If there are too many people waiting there, it becomes difficult for CMs to get guests using wheelchair to the sports thy need o be in. (And, actually, we have been there when time ran out and guests from the 'regular' area were already sitting in most of the wheelchair companion spots.
So, if they know it will be full, they may not allow guests with GACs for that show unless they need to sit in specific spots (for captioning or other reasons).
The show is not usually so busy. So, in most cases, once you enter the building, the wait is not generally going to be long.
The other thing that is currently happening is renovations to add Fastpass Plus.
None of those 3 attractions have Fastpass, so they will need to renovate to make new lines for Fastpass Plus. From everything I've read, it sounds like all attractions will eventually have Fastpass Plus available.