I've spent the past few years without osu, I only recently started playing and being active in the community again. In those years I pretty much just lived a normal life. Finished school, worked, went out with friends, played different video games.
I would have never had gotten to hear some of the awesome music out there. osu! actually has beatmaps with really good music sometimes IMO. Would feel empty inside not having my main source of hearing new music
I'd still be playing League probably. I started playing osu! to improve my mouse accuracy in League and then realized that this game is better for me. Probably also be playing more ssbm than I already am.