[2nd Star]

This is what we use to check how crowded the parks are.
TouringPlans.com - The Unofficial Guide to Walt Disney World
I like EMH at night because its 3 hrs more. Last trip we did EMH night at AK and never had a wait.

[lovemysons]

Here's another tip that turned out to be pretty true our last trip. The parks that have an EMH at night, tend to be less crowded the next day, as in, if Epcot has EMH on Mon night, Tuesday morning tends to be a good time to go there. (purely example, not really sure when EMH is)

[tonyksl]

Originally Posted by fjs08

I make it a habit never to do early morning Extra hour parks. They seem to be overcrowded.
Late hour Extra hours are a different story. I love to do MK on those nights.
It's crowded but if you ride rides during parades or fireworks, they are pretty empty. That is of course if you don't want to see the fireworks. Or do an outdoor attraction during the fireworks so you get the best of both worlds.
You have to plan during the parades though so as not to be caught in the crowd or "trapped" by the parade or ropes. Most of the time, there are cross walks along the parade walk up to the time of the parade.
Frank

This really depends on the time of the year. When the parks are open late and it is a busy time, the mornings are typically better. The crowds in the morning disperse very quickly once the rope drops. When the parks aren't open late, such as during the slow season times, the crowds are a bit heavier, but, not so bad because there aren't as many people at the resort. And that gives them the extra hours of sleep they don't normally get during the heavy traffic times.