After watching your video, I followed the link over here to read your trip report. It's as good as the video.

I am impressed at all the thought you put into things ahead of time to help your daughter. A lot of people expect the Guest Assistance Card to do everything, but it works much better if you use as one technique in a whole group of things - like preparation, ear protectors, sunglasses, etc.
Since Guest Assistance Cards (GACs) have been mentioned a number of times, I thought it might be helpful to point readers toward more information.
Post 6 of the disABILITIES FAQs thread is all about GACs.
You can follow the link in my signature to get to that thread.
Also, this is a picture of one of the handicapped waiting area.
This shows Monsters, Inc and is pretty typical. The left side of the picture is the 'regular' queue and by the time the show starts, it will be pretty well packed with people.
The right side is a fairly narrow chained off lane where guests with wheelchairs,
ECVs, strollers as wheelchairs, etc. wait. You can still see and hear the other line next to you, but there is more room and usually there is a wall on one side, so it does provide a little more separation from other guests.
This picture shows Small World.
It's a bit confusing, so here's an explanation that I hope makes sense.
The people on the left side of the picture, in the numbered area will be the next to board (guests using the handicapped boarding area board on the exit side). The CMs direct one (occassionally 2) boat load of people to wait in that area a few minutes before the will actually board.
The 2 lanes in the middle of the picture are the exit - guests first walk toward the camera, then turn the corner and walk up the ramp to the exit.
The lane to the right of the picture is the handicapped waiting area, and at he point I took the picture, it did extend all the way up to the top of the ramp. When it is that long, it will usually be a longer wait in that line than in the 'regular' line.
So, if you have a GAC and don't need the wheelchair accessible boarding area, you should consider whether your needs might be better met by waiting in the 'regular' line. Especially in that line, it is pretty tight and has rows of bars, so once you are in it, you are not easily able to get out.