Massachusetts, Maine and parts of CT have spring break the week of April 18. It is always the third week in April, no matter when Easter is. This is when we were there this past April. It was also after Easter, and after what Disney considered to be peak season. It was quite crowded. Not only that, the parks closed earlier than they had just the week before, the MK closed very early some nights for grad nights and private parties. We still had a great time, the weather is wonderful, but I would not expect the crowds to be small just because it is after Easter.