We are planning our first ever trip to Disney World for either April 8-11 or June 16-19. Which would be better for lower crowds? Would there be much of a difference between the two? I wasn't sure if my dates in April are Spring break dates in the US or not. Are my dates in June early enough to avoid the heavy summer vacation crowds? My daughter's classes run until June 28th, but I wasn't sure if that's the norm or not. Which dates would you recommed and why? Thank you so much!!!