We just ate there for my son's bday lunch, and when our waiter "Rodeo Ricky" brought out the dessert for ds, he had chocolate all over his face and he told ds, "I tried your dessert and it was really good -- I hope you don't mind!" DS thought it was hysterical.
They made hats for all of us out of the napkins, and the guy at the next table got loudly reprimanded for ordering a Pepsi "He said the P-word!!! We don't USE that language around here!"
They didn't do the horse thing, even though we were there close to 2 hours. There were only about 4 parties in there, so maybe they only do it when it's busy?
Have fun -- the food was really good in addition to the silly antics. Plus it was great to get away from the heat and noise of MK for a couple of hours.