Go early to the parks. We usually leave by lunch or shortly thereafter, because it is go crowded. We always go back around dinner time/early evening. Use fast pass. Stay away from MK on Easter Sunday. If you plan to have an Easter Dinner somewhere, plan ahead. We always go to Cafe Cape May for Easter Dinner. The waterparks will often be closed by 11:00 am. They even closed MK by early afternoon a couple days, but reopened late afternoon. It is crowded, but we always go at Easter. We will also be at BWV from April 9-16. One good thing -- the parks are usually open quite late.
Always go to the second showing of Fantasmic at MGM and go the second showing of Spectro. The first shows have people lining up about 2-hours ahead. Have a great time!