We were there in 2010 those from March 6-13 and the parks were not bad at all. The usual things had long waits (SM, Soarin, TSM...), but they were very easily managed with the use of FPs. The weekends were quite a bit busier than the weekdays. We left Saturday morning which was the "first" day of the spring breakers and the airport was PACKED with people coming in. I think if you manage your time and use FP it won't seem too bad.