After sixteen years of pushing the same buttons on the A320/321, I felt stagnated. So, I added a Comm-Glider rating last summer.
I hand-fly the bus more than most, but getting out and flying by the seat of my pants and working thermals to keep a glider in the air was a CTRL>ALT>DEL for my brain. If you want to improve your overall skills, go fly a glider for a couple of hours. It's done wonders for me.
