One year I could barely walk due to sprained ankle but I would not use a wheelchair to cut lines.
One year at King's Island about 3 weeks after a C/S, my parents were in town and my older kids wanted to go...Hubby got me a wheel chair, but we didn't use it for any advantage, except to prevent me from having to walk around the park.
I would never have used it for any advantage, because I couldn't ride and I didn't want to teach my children that it was ok to do something like that.
There are people out there who really need assistance. Some parks are doing away with their versions of the GAC, for these exact reasons. I think at one point in time Dollywood used to offer a non-rider ticket (due to age/disability), but were forced to stop because of abuse/lawsuits.