I'm not one to complain or make a fuss. I am more likely to write a letter commending someone for going the extra mile, though.
That being said, I think Disney does do an extraordinary job of trying to make their customers happy. We had a problem with a priority seating for a very large party (20 adults and children) at the character dinner at GF. I never complained, but I did stand in front of the hostess station for over an hour, waiting and occasionally asking about the status of our table.
We were finally seated (an hour and a half late) and had a wonderful meal watching the children enjoy their interaction with Cinderella and friends. By the time we finished eating, the long wait had been completely forgotten. When I asked for the bill, and the server told me they were comping our entire meal, we were amazed and delighted!
It wasn't something we expected or felt entitled to, but it sure did impress us!