I want to chime in too, as the grandparent of a high functioning autistic child. Waiting in line was horrible for us and those around us. As a matter of fact, I was just reading the thread on loss of manners and someone complained about misbehavior waiting in line- yeah, not by choice on our part- he just doesn't understand how to be still/quiet/respect personal space. He thinks rolling around on the ground and knocking into you is normal- he doesn't really even know you're there.
So, anyway, it was a horrible experience for all of us. But my daughter wouldn't ever let us use the GAC because she felt he didn't deserve to get on the ride any faster than anybody else. It's not fair to cut in front of people. Praise God for the DAS coming along, since we don't cut in front of anyone, just use the time to take him somewhere else (like get a mickey bar) while waiting, we are not being unfair to anyone else, so she lets us use it.
I think this system is fair and equitable. I realize that some kids do focus on one ride and want to do it over and over again, but you have to look at the overall picture. If every DAS in the park wanted to do the same ride over and over (think FoP) regular people would never get on it.
We have had very good experiences with DAS, and sometimes the CM even fudges on the return time a little (we don't ask, they just do). I bet if someone explained the situation to the CM at the attraction, they may fudge a time a little for them- unofficially of course. But over and over seems out of proportion and we all know the degree of dishonesty that would ensue if this were enacted. Isn't that the reason for the switch from GAC to DAS in the first place?