We were there for Easter & the week following. It was packed, you could hardly move. LONG lines for everything.....even the bathrooms!! We were wishing they had fastpasses for them (since we had a 2 yr old). It was hard to get up to see the characters because of long lines & when you did get close, it would be time for the character to leave (very heartbreaking for our young ones). Thursday following was the best day of the entire trip......smaller crowds & we were able to flow easily thru the parks with short wait times on the rides (even in Fantasyland).
There are no decorations or special events (other than the buffet held at the DLH). We did pick up a Mickey plush in a bunny costume & a pin but other than that....you wouldn't have known it was Easter.
If you could plan for a different time, I would. Not only is it a holiday weekend but spring breaks will be in full swing during that time.