In a crowded rink, you have to put everything else out of your mind, lest you damage yourself or others. When I've had tough weeks at work, which I've had plenty of this year, rollerskating at a rink running a popular roller disco on a Friday night has provided a clean-room level of buffer between my stressed-out work state-of-mind and my happy-go-lucky-parent weekend state of mind.
Not everyone's cup of tea, but if you need it, and you're yet to find a satisfactory "thing", give it a go. Seriously, you need to have all of your faculties applied to the job at hand, there's no room for the rest of the world, and so it melts away.