At my workplace, you really just use them whenever. I'm a developer and we are encouraged to change environments when we are stuck or working on solving a problem. Or any time you just need to recalibrate your brain for 10-15 minutes.

Obviously, you can't just sit there all day, but sometimes we like to go there when others go for a smoke break. And sometimes nothing works and everything is annoying, then you can just say: "I'm gonna take 10 and come back with fresh eyes".