I go to WDW on all the holidays--I'm a teacher--and they are all very, very crowded ON CERTAIN DAYS. If you avoid those days, your visit will be much more pleasant. At Christmas the worst days are Christmas Day and New Year's Eve. During the 4th of July, all the parks are bad in the evenings for the fireworks, and at Easter it's bad on Easter. Every few years Easter becomes horrendous, due to how Easter falls. Due to the fact that I am claustrophobic and have panic attacks when enclosed, I stay away from the Magic Kingdom on all holidays, especially the 4th.