Late April this year WILL be the week after Easter (Apr. 16). I suspect that the crowds will be at the moderate level as they tend to be this time each year. They will get heavy again as the Memorial weekend closes in, then should remain steady throughout the summer, then drop in late August and September. We already have our late April/early May trip booked (Apr 23 to May 6 @ BWV). The weather makes up for any crowding you encounter. As always the weekends will be the worse. Lots of locals like to visit this time a year before their blackout times start on their seasonal APs, plus there are many school groups having their senior trips, and of course, Grad Nites too for several weekends at the end of April (which doesn't affect the parks during the day very much--but MK will close early on those Friday and Saturday nights)