Man, my thumb is on my dropper lever constantly!
Lower it an inch when railing a turn, and you can outrig a leg and carve.
Drop it out of the way entirely for a super-steep descent and put your butt on the back tire.
Low branch? Drop it two inches and stay seated while you duck.
High speed on a flat trail? All the way up for max leg extension.
On steep, rocky climbs, lower it a half an inch and get on the nose of the saddle for traction while keeping the front on the ground.
Seriously, I use my dropper more often than my shift lever. Can't imagine how I rode without one.