According to attendance numbers that I've seen published in some of the guide books, the week of Easter and the two weeks before and after are a major peak period. The past two years we've been in April, and the que times for major rides have reached the 60 minute wait by about 11:30 or so. Thank goodness for FASTPASS. I did notice that starting the week of April 7th, the week we'll be there, they've already shortened their park hours on the WDW website schedule compared to the previous two weeks. Have a wonderful time!