I only went to one panel with a huge line and that was the Venture Brothers panel. The volunteers kept angrily telling the people who asked that the line wouldn't start until 1:30 so come back at that time, which just resulted in a mob of people hovering around the room until the okay to lineup was given. Since the room was connected to the Atrium of the Marriott, the Venture mob merged with the usual Atrium mob and formed an ultra mob of confused people.

This was my first year back to con since 2009 and the Venture panel lineup that year was handled well from what I experienced. I don't know if the issue with it this year was that area already had huge crowds milling about or poor organization from the staff in charge of the area. Probably a mix of both. I understand why the con wants to limit how early you can line up, and I agree with the idea, however with the Venture panel it led to unsafe levels of crowding.