You get used to it. I think people try it for a short while and give up.
Even playing fast-paced shooters on a widescreen will make me slightly “screen-sick” if I haven’t played in a month or two, but it goes away by the next day.
I found VR to be worse for the first couple days, but then it fades, too, and pretty quickly it becomes second nature.
Worst thing I found with VR headsets is the heat. Those displays and sometimes the gpu (depending on headset) get warm, and the HMD is snug on your face so it gets too warm sometimes.