It's possible most of them are now using the combination of tab containers and the "snooze tabs" extension, rather than trees. A test pilot feature that lets you mark tabs as "I don't want to see you until tonight/tomorrow morning/the weekend/next week/etc". It really cuts down on the need to keep 100+ tabs open (you just silo the tabs based on their role, then snooze all the ones you don't want to lose but don't need in the slightest right now either).