I have never had to evacuate an aircraft and hopefully never will.
I have been in charge of buildings and had to evacuate due to fire and bomb scares. It is hard enough to get people to multiple exits with wide corridors and to clear a building expeditiosly in those circumstances.
Those who keep banging on about collecting belongings and paperwork from an aircraft in extremis, because of problems that may arise after the event, should ask the airlines to have a tape made to be played just before the aircraft meets the ground.
"Passengers who wish to survive this event should, immediately the aircraft comes to a halt, leave the aircraft by the nearest available exit, checking first that their exit is not obstructed by fire and taking nothing with them Those that wish to gamble their lives because their possessions are more important than their continued existence should remain and assist those that want to have a chance of life to leave the aircraft. Once those passengers have left then, and only then, if you are still alive, may you collect your items and depart the aircraft."
Anyone who puts possessions and paperwork before life, whatever the problems that may arise later, is just plain dumb.