I found myself better at a lot of games after being so intense in SCII. Co-ordination, decision making, a better understanding of strategy, all improved. I got better at Chess, was able to pick things up quicker.
Great experience but I'm too burnt out to keep going in SC2. It got so hard you had to treat it like a job.
The thing about SCII competitive is, once you seriously get competitive, every single game you play is such an absolute mental drain. I used to have to do pushups / run a few KM before a few games. I had to mentally prepare myself for every single game.
Once you play at top competitive tier in SC2, every other game is honestly a joke (videogames, not boardgames). What other games REQUIRE you to have 300APM? None, that's how many.