I have been going to Disney the last week in March for the last 10 years, and it's never too crowded, except during the years that Easter falls during my break, like it does this year. I always go during spring break, summer, and Christmas, and believe me, you don't know busy till you have been to Disney on Christmas Day or New Year's Eve, or on the 4th of July! The March times are not bad at all, provided you get an early start on the days you go into the park. During many of the years when Easter isn't in March, Disney even offered specials on their rooms ($89) and offered unlimited boat rentals and bike rentals during your stay for $100 for the family. I spend my weekends in cash rooms, so that worked out fine for me. I would think that early March visitors would have the same specials in non-Easter years.