We went Easter week this past year (end of March). We woke early and did the parks like the books tell you, and I thought it was fine. We had great weather, too! Then we went for two weeks (last week in June through July 8) and I thought the crowds were much worse and the heat made walking unbearable. My family agreed that we would do Easter week again before we would do summer again. I would plan for us to go again in April 2006 during Easter week, but we've decided to try HH instead.
We did go Easter week another year without a good plan (I don't know what I was thinking) and I said I would never do it again. But, we did! I also now say I won't go in the summer again, but I know we will!
Oops. Sorry to ramble. My kids have off the week before Easter in 2006 and the Monday after.