DEN was busy, but not crazy. MDW is its own special hell. Last year they had a goofy system for drop offs. For security, you all get funneled over that bridge. The expert lines are worst because everyone thinks that they are an expert... and they're not.

Funny on the departure drop off, I've done the opposite in DEN when weather gets bad, flights get stacked and the pick up clogs up with people unfamiliar with the utility of a cell phone to check arrivals and contact their pick ups.