Holidays are very crowded at the park. Easter just as much as any other holiday. You have out of towners and locals who somehow think that it is not going to be crowded. They are sadly mistaken. You will feel the crunch around 10. Maybe a little later.
We've been to the Park the past two Easter's and though we actually enter it after our Buffet at the DL Hotel, it hasn't been too bad. Of course we don't go there looking to do everything in one day. In fact, we just got back from a week long trip there, so our day will mostly consist of hanging out and catching a few of the main rides and finish it up with the fireworks.