A sort of related anecdote: one time I was on a plane where there was some sort of medical emergency in the back, so we had to wait to let paramedics get on. Eventually they had the patient stabilized but needed to do more work before he could be moved, so they allowed the plane to be unloaded as long as the aisles could be cleared quickly if they needed to get through. In order to allow this, the crew only let one row at a time to stand up. I wish I would've timed how long it took, but it was definitely much shorter than the time it usually takes to get off when there is no organization.
