I basically only play in VR at the moment since I bought my Oculus Rift.

I spend most time in VRchat. Socialising can be fun if everyone is a cute anime girl.
I actually met some Japanese people and tried my language skills and was actually able to communicate with them on some degree.

Story about pic related:
I joined a Day of Defeat Miku Avatar server to chose an avatar.
Met a group of people (mostly Japanese) with Wehrmacht Avatars trying to shout German stuff.
We somehow decided to "invade Poland" so some one opened a portal to a Polish themed world.
We met some Russian people in that Polish world (that's whats on this picture) so we decided to join a Russian world after that.
At the end we joined a random server and everyone switched to a Tiger tank avatar for a reason.


Other games and apps I can recommend are:
Serious Sam VR collection (buy it in a steam sale it was 90% off in the last)
Shooting lots of enemies buy pointing guns at them is fun. Aiming with the controllers works really well. And having two Miniguns is just fun.

Google Earth VR is a really nice experience.
With the new 3D cities (most bigger cities in important countries are in 3D now) it is really nice to move trough them.
Street view is also nice with the higher field of few.
Of course I spend most of my time in Google Earth VR in Japan.

Some other games I want to play but I can't really at the moment:
Subnautica is just beautiful in VR but I get VR sickness very fast because there are no methods to prevent it in that game and the controls are really awful. But it's beautiful.

Minecraft has a VR mod but it does only support older versions. But I don't really want to continue playing on my old server right now.

VR helmets seem like a poor substitute to the VR rooms that USAF uses for pilot-training.