Having been pressured to install GTA V onto my PS4 so I could play online with friend (it's really not my preferred type of game), I was simply blown away by the environment. Nothing else on the PS4 comes close, as far as seamless expansiveness goes.
To be honest, it's so immersive that in my opinion, GTA VI (or VII) should definitely support VR when they are released.
Watch_Dogs 2 looks much better, try it! I also installed GTA V recently as my cousin pressured me to it, ended up in "FAST" team in stunt races; overall it's too repetitive, only stunt races seem to be fun and all the stuff I had to do to earn money (Doomsday Heist loops, Super car warehouse sales etc.) is just to buy best cars for those races. Comparing to Watch_Dogs 2 it was a significant downgrade in almost everything, unless you treat GTA V as a "psychopath simulator", then it has no competition.
I still find Red Dead Redemption to do a better job at being immersive.
It's obviously much less pretty than WD2 and GTA5 (heard there was a fancy re-release though?), but it feels much more alive. And I suppose the 'wild west' environment being less demanding than a modern city helps too.
To be honest, it's so immersive that in my opinion, GTA VI (or VII) should definitely support VR when they are released.