Funny how perhaps "localized" this might be? Grew up an only child but now I have 2 kids, and "couch multiplayer" is now perhaps the majority of my game time.

This is where Steam shines;e.g. Speedrunners, Boomerang Fu, and the very deceptively deep Bopl Battle. Co-op too. Not a huge fan of the cooking games, but Bish Bash Bots is a fantastic co-op tower defense game.