A great use of VR without full-body controls was "Sir, You're Being Hunted". They changed nothing about the game when they added VR support, except that instead of being able to press ALT or whatever to free-look your head around, you could just... look around. All other controls and whatnot remained the same.

Funny aside about that game, the initial development had promised multiplayer, and then the dev team went incommunicado for like 2 years, during which time everyone assumed the game had died. Then 'Surprise!' multiplayer release. Another year of radio silence and boom, VR support. Mind you, VR headsets were not yet widely available, as in maybe you could see one at some sort of tech fair, but there was no chance you could just go into a store and buy one.

I worked at a startup once and we had early access to the Vive before release. We did a whole VR horror that was set in one hotel room. Imagine something between The Ring and PT. It was unfortunately never released but we never found someone who could make it all the way through without needing to take the headset off.