Its that bad. Its a well-studied phenomenon called 'simulator sickness'. A kind of aphasia, for some it can persist for days beyond the initial experience.
If you don't experience it, good for you, you are one of the lucky ones.
No, you don't know what you're talking about. Simulator sickness is not a black or white issue. It's even possible to avoid it by making the display worse.
Makes sense - worse means less involvement with your sensory expectations. Its when you're brain is convinced it should sense vestibular changes and it doesn't, that you throw up, get nauseous and dizzy etc. The difference between 'looking at' and 'believe you're inside of' a simulation hinges on the quality of the experience.
If you don't experience it, good for you, you are one of the lucky ones.