I am never sick when doing roller coasters or reading in a moving car, but I was really nauseous after my first 15-min VR session. I was pretty scared I fucked up buying a Valve Index only to get that much sick playing... But I had a feeling (hope?) that I could get used to it: After about 2 weeks of playing a bit every night I was no longer getting sick at all. I can go until the controllers run out of battery now.

To me the effort was worth it, but I have a friend that was the opposite and didn't enjoy experiencing virtual worlds that way...

My advice: If you ever try it then try to ignore the sickness -as you can get used to it- and focus on how much you enjoy being immersed in virtual worlds.