Princess uses a two-part tag system; you have to show your tag stubs at the gangway to get off.
It didn't seem to help much. It was still a mess; mainly because nobody was paying any attention to the instructions. They kept making announcements asking people to keep the stairways and corridors clear but people clogged them anyway.
What's the rush? Book an afternoon flight. Have a nice breakfast. Relax on deck. It's all over soon enough!