It's been quite a while since I logged in on Steam, so I don't remember the actual number, but if I had to throw out a guess, I'd say... maybe 60? I typically only use Steam to double-dip on games I already have on console or for Visual Novels that aren't available on PS4/Vita (mainly 18+ ones).
I'm more of a mobile gamer than a PC gamer, so I only have 8 games on Steam. Don't really have any plans of purchasing anymore since I rarely open up Steam as it is. Maybe one day I'll get more into the gaming world.