CMs have told me many times that the week BEFORE is MORE crowded than the week after. We go every year at Easter (Friday before to Saturday after). The parks will all be open quite late -- especially MK (Midnight). In fact, this past Easter week it was open until 3 am a couple days. The parks might close for a couple hours during the day, but they will reopen. The waterparks are usually extremely crowded -- and often are at capacity by 11:00 am. The 5-days before Easter Sunday are usually the most crowded, with a lot of people leaving to go home on Monday after. Make all your dining reservations ahead -- especially Easter Sunday dinner, as that day fills up fast.