The dates I'm thinking we would be arrive Wednesday after Easter and stay through the following next week.
I have been twice right around Easter.
In 2015, our Spring Break was the week
after Easter (Easter was April 5th). It was super crowded - 9s and 10s across all the parks. I checked the touringplans historical crowd calendar for the week
before Easter 2015, and it was also super crowded (9s and 10s).
In 2017, Easter was later in April (April 16th). Because Easter was so late, all our schools had off the week
before Easter. It was super crowded - 9s and 10s across all the parks. The crowds dropped of on Saturday and Easter Sunday, and the week
after Easter had substantially lower crowds than the previous week.
So based on my own limited personal experience and on studying touringplans historical crowd calendar for the past several Easters, when Easter is really late, most schools have off the week before Easter and the crowds the week after Easter are lower. When Easter is in March or early April, both the weeks before and after Easter are super crowded.