When we were there the first weekend, we were at the front of the Fright Lane queue at Condemned (trust me, I do have a point related to CornStalkers here). One of the groups suggested that they just start the night "with a conga line" by opening the door and just letting everyone in. The other grouper, thankfully, shut that down, and told us they are supposed to send people in groups unless/until the crowds and queues get to heavy.
So, I imagine we should expect that the groupers have the option to allow conga lines on busy nights.