We were very polite with our GAC and only used it when necessary. DS does the "freak out" thing in lines, but was very patient waiting in alternate areas. We tried to get him used to lines where they were outside and easier to handle.
We waited in Snow White for about 4 switchbacks, which was about his "limit" and we saw a family of 5 adults and about 6 kids, all using one little boy's GAC, because the kids were little and the family said they didn't count in the 6 person total.
Boy did that burn me up. Certainly if a family member needs one they are entitled to it, but Aunt Mary, Uncle Joe and the 3 cousins? The Mom was like "yeah, come on, we can get right on this way" and they were laughing and running to the cars. I felt like they were giving me and my family a bad name! I could see the CM felt a little helpless when they all started plowing through the gate, but he didn't want to interfere.
We've used the GAC to request seats near an exit, because DS also likes to stim/talk and if he gets too loud, we want to be prepared to take him out so as not to disturb other guests. But my husband reminded me that there's babies crying and little kids talking all the time, just 'cause DS has a deeper voice doesn't make it bad!
Sometimes the Disney Magic takes over. I know it did when we were there. Have a wonderful trip. Maybe we'll see you there in August. This is our second trip this year, because DS is asking to go back.
The CMs are wonderful - I can't think of one bad experience we had.