My dad, who is new to racing sims and gaming in general, went instantly quicker in VR than he could 'driving the TV'. In trying to set up a multiplayer LAN game using two PC's and two nearly identical wheels G25/G27, he was over a second per lap quicker in the identical car and setup when in the Oculus, to the point it meant we couldn't really fairly race each other. More than that though, it was far more consistent in VR, where as in 2D, he could sometimes luck into an equally fast lap almost from muscle memory.
I could have eventually gotten the exact same laptime out of the 2D setup that I could from 3D, but it would have been from a lot of circulating and getting a feel for car placement from pure repetitive experience. In VR you're just 'there' and turning points and car placement is obvious from the first lap. You can literally look further up the track at where you want to be and just drive that line, rather than having to learn through repetition where to turn in and what line to drive for the best exit. I find being able to look far ahead crucial for finding the line, even with DK2's poor resolution it helps me. The view turn with wheel turn 2D compromise makes it harder for me to feel which way the car is going. Using the buttons to look is clunky as you don't get to chose which part of the side window you're looking through.
I don't want to go back to a monitor after using VR, just like I don't want to go back to my original LFS joystick throttle and mouse steering setup after using a FF wheel!
You can learn to be fast on any equipment, a mouse and keyboard with a 12" CRT monitor, in a game with weird feedback etc. But I think a decent force-feedback wheel is more intuitive to someone used to driving a car, and a decent VR setup is more intuitive for someone used to having two eyes and a neck.