We go every Easter and I love it. The resorts may do something special for the Holiday. At the Polynesian last year, We met Chip & Dale and Thumper (Who was awesome). There was a dance party thing going on and a Candy grab. This was all over by that sunset point. The field was covered in huge piles of candy and the wrappers sparkled in the sun. I know it sounds silly saying how beautiful the candy wrappers are but being outside on Easter in the warm sun and seeing all the sparkly glitter was just amazing.
Magic Kingdom Easter morning is cool too. Something about being on Main Street Early in the morning when it isn't so packed. Hearing the Easter music, the trolly show, seeing Mr and Mrs Easter Bunny. They also have these girls come out (I can never remember what these girls are called) dressed in beautiful southern belle dresses of all pastel Spring colors. They meet all around the Main Street hub.
Now, last year, since they had Limited Time Magic, they did an Easter Parade Pre Show before the 3pm parade. I loved this because the last time I saw the Disney Easter Parade was during my Senior trip in 2000. I wish they did this every year. It added so much to the day.
That is about all I know. I don't know if Epcot does anything except the Flower festival (oh, and the Flower Power concerts in the evening).
Just make sure you check your scheduling/resort packet. They will tell you what events are going on during that day. I'll go upload some pictures to tempt you
