Maybe this is cheating, but having played WoW, EVE, and other games, it's made me a fantastic DM for my DnD group.

I learned time management skills as a result of playing the games.

And reading about player's builds and watching PvP videos, studying the "cookie cutter" set ups that players come up with, taught me how to identify value within a context. I didn't learn how to read the stitches on a fastball until I watched someone else do it, and that didn't happen until I became involved with MMOs.