EMH at MK until 3am when we were there in Sept 08 and it was honestly one of our best memories of the trip.
By about 1230am, the park started to clear (although it was never THAT busy anyway), even our friends that were traveling with us left, and we enjoyed the evening until 3am.
We walked on to everything. Rode Buzz and Space Mountain like we owned it!
Most of tomorrowland was deserted, and when we walked out onto Main Street to leave the park, there were maybe 50 people walking out with us… the park was ours… :wub: