I group my games by interest:
- probably never - games I disliked or games in genres I don't like (mostly from bundles)
- maybe later - no intent to play, but there's a chance
- soon - games I'm excited to play
- playing - up to 5 games I'm "playing"
- done - played enough that I'm satisfied and don't intend to touch again
- replay - game still has replay value, but I'm done with it for now
- sequels - something in soon or playing must come first
This helps a bit with deciding what to play next and works well for me.