There were college cheerleaders at WDW when we went over MLK weekend in 2004, and the ones we encountered were great. We stood in line at TOT with about 6 of them, and they talked with DD the whole time, and were really sweet. They even gave DD a hug when she got off the ride crying (I know, I'm a bad mom. But, she wanted to try it!). I think the fact that they are college kids, and not exactly teenagers anymore, makes a big difference.
We'll be there over MLK weekend again next month and I'm not too concerned about them.