I see alot of people here who have GACs saying that they use it only as a last resort and that they usually just use normal fastpasses. Of course I also see others who use the GAC as a fastpass but I can't say that it's an abuse since I'm not them and don't know what prevents them from getting a normal fastpass.
Bill, I don't think you were actually asking for reasons, but I thought it might be helpful to others to explain why we go ahead and use the GAC as a Fastpass.
Our two DDs are quadriplegic and use power chairs. The first time we tried to get a GAC, we were refused, so we tried getting Fastpasses at each ride instead. After a couple of rides, the girls were totally exhausted criss-crossing the parks to get the passes, and it was especially hard on my DD who is extremely heat sensitive due to a metabolic disorder.
So we tried sending my husband off to get the Fastpasses, but that left me alone to take care of two people who each need one-on-one help much of the time, including one who needs to be closely watched for signs of overheating or metabolic crisis. In an environment like a Disney park, it's hard for me to even walk with them into a building to cool down by myself, as they both have dystonic posturing in their arms, making it hard to get through doorways or narrow aisles without help (plus I couldn't move too far from where he left us because we didn't have cell phones at the time, and he couldn't have found us).
Once he came back with the Fastpasses, then we had to coordinate being at the ride at the right time with criss-crossing the parks to find the companion rest rooms, doubling back to first aid for them to rest out of their chairs, staying on top of frequent feeding times for DDs metabolic disorder, etc.
So, the next time we went to WDW, I pushed a little harder to get a GAC. We don't use the GAC at a lot of rides because there really aren't a lot of the rides with FP that DDs can even ride.
Someone mentioned getting up early so they could ride before the parks got crowded. This really doesn't work for us because it takes quite a long time to get both the girls washed and dressed, medications mixed and given, meds, approriate snacks, cornstarch and other needs packed in backpacks for the day, and lots more I won't go into. Plus, we can't go ride a few rides, then have breakfast. We absolutely have to feed DD in our room right after she gets up. Oh, and all this is after getting up 4-10 times during the night to shift their positions in bed.
And because we can't get to the parks early, the Fastpasses will either be for times that are late enough that we can't use them (the girls can't last very long at the parks) or will be out for the day.
What I'm trying to say is that DDs situation is a lot more complicated that just using wheelchairs, and having the GAC makes a difference in their having the opportunity to ride rides and enjoy their time at WDW.