It was the same last year, IOA closed at 5pm, USF at 6pm. It's better to be on the USF side, ride the Mummy as the park is closing, go to the stay and scream area, and go thru two houses with no wait.
Last year, they let us go at 06:45, so I don't think they can clear the park any faster than what they do. I remember last year, everyone did the two houses in the stay and scream area, and then had to wait while they cleared the park. My page from last year is here.
http://www.nogodforme.com/HHN14.htm
It would be cool, if they could make it so people could do 3 or 4 houses from the stay and scream area. This would reduce lines if the stay and scream people could get more than 2 houses out of the way early.