That Coasters after Dark events are really, really packed. I think that many people don't spend the whole day at the park, and come during that event. No flats are open except Giant Drop, and thus all the people are over the coasters. The first time the park did this they actually took a train off of Batman. They soon regreted it as they seen all the people in line for it. They eventually put it back on.
"I've been staring at the world, waiting. All the trouble and all the pain we're facing. Too much light to be livin' in the dark. Why waste time? We only got one life. Together we can be the CHANGE. So go and let your heart burn bright"