I went last year during Easter Week and based on our experiences last year, I would do Spring Break every single year.
I don't know how old your kids are, but I had teens with me, so we did a lot of nightime EMH. We'd hit a park in the morning - not always RD, but close to it, and hang around til things got crowded after lunch, then head back to the hotel and chill for a bit. Then we'd go to dinner, and then hit whatever park had night time EMH. We stayed at Magic Kingdom until 3am towards the end of our trip, that was so much fun!
The weather was marvelous (first week of April) and we were able to dodge crowds pretty well by doing early mornings and late nights. I'd do it again in a heartbeat and it's actually making me super sad that we have no plans to go this year or next.