That is very farm from the truth. Almost all DJ's I've heard at Viva and Guvernment have played for a lot longer than 2 hours. It's only at rave parties that DJs played less than 2 hours(and rave parties barely ever have great Trance headliners nowadays)
Best example is Deep Dish - they...
They had problems with lazers that's why they shut them off. They will be fixed before next party.
As far as overpacking goes, I'm pretty sure it's Destiny who is responsible. Regular Viva clubnights are never overpacked! In fact, they refuse admission to people once the club reaches capacity!