We went to Universal Studios one year with our kids. We had a great time with the exception of two times when the same group of 8 people accompanying a person in wheel chair were placed in front of us after we had stood in line 30-40 minutes. These people got the best seats in the attraction and were really whooping it up. The person in the wheel chair looked perfectly healthy to me. They probably did not have to stand in one line all day.
Disneyland has cracked down on this little fraudulent activity. Great!! Hopefully other parks will follow.