We used to always go in the summer, usually august, but now oldest ds is a lifeguard so that basically rules the summer out, but we went last year for easter, that was our 3 ds spring break, the crowds were heavy but manageable if you planned well, fast pass, early entry, all dining arrangements made beforehand etc., This year we went with the ny spring break crowds, last week of april, it was fine, I think next year the spring break coincides with easter again, so we will go then. I personally was getting sick of all the humidity, not good for ds l5 asthma and with all the rain, I was always having to readjust all our plans, one day our sneakers were not even dried out, we walked around the mk with our water shoes on. Even dh had a case of the temperature tantrums, so its the spring for us for now on, the weather is much better.