interestingly, the most insane VR game I've played is actually Elite Dangerous
I've got a full HOTAS setup for it
and the ability to fly around the galaxy in a simulated spaceship is quite insane
not to mention a massive advantage over non-VR players
the ability to turn my head, track an enemy and target them by looking at them while keeping my hands on the stick and throttle is nuts
driving games are fairly crazy too, but they push the GPU pretty hard still since there is a lot more going on in rendering good driving visuals vs rendering space