Hiya,
just to add from our (single) experience,
last year we went at half term (1-3 June), the parks closed at 6pm and we were
really surprised at how quiet the parks were - especially in the morning (opened at 10)- the only queue we encountered was 40 min for BTM (fastpass system had broken down) - dumbo, teacups etc in fantasyland were walk on and less than 10 min on PETER PAN

(until around 12). The kids were too small for the BIG rollercoaster rides, so they may have been busy, but most of the rest was walk on.
People started waiting for the parade about 30 min before it, but there were actually GAPS! in fantasyland where you didn't have anyone trying to push in - I'm expecting it to be ever so slightly different this year (12th to 17th April)
But, with EMH at least the disney guests with young kids who HAVE to get up early anyhow!!!

will be able to use that time!!! at least on early EMH days ...
Tessa