We are thinking of going next year during our Spring Break which falls the week prior to Easter. I know this is one of the busiest times of the year. How crowded was it?
We went the 6-13th. This is our 4th time going over Spring Break. It is crowded, but if you use your FP wisely and get there at opening it can be done.
We only waited 10 minutes 25 minutes after opening for EE, Soarin we were the first group to ride. We did both of those rides a few times. We did not wait in any other stand by lines except HM and POTC because those don't use FP. HM was 30 minutes from the time we got in line until we got off the ride.
I also used TGM and it really helped. We did everything we wanted and even some new things at each park.
I have only gone in Spring so I really can't compare crowds.