FWIW I would get [motion] sick[ness] (not actually throwing up, but nauseated) from just playing Halo 1[1] on a regular TV (~32"). Could play fine in co-op/split screen though.
And while the "house on a hill"-demo that's bundled with DK2 is pretty bad wrt motion sickness -- I've logged quite a few hours in Elite: Dangerous without problems -- and have no problems with the spartan desk scene that's used for testing/setup of the DK2.
In short, I believe Oculus/Carmack's hard focus on fighting motion sickness has paid off a lot -- today's VR is nothing like the VR of the 90s.
I've yet to try the gear/paper-kit/other things thank the DK2 -- but that kit itself gives me no issues. Poor software/scene design does -- but we already have those issues with 2d (I doubt I'd be able to play Mirror's Edge -- although I haven't tried it).
[1] Ed to add: The team behind Halo 1 did a terrific job on camera motion, overall speed/paralax and scene design in fighting motion sickness. But still, at full screen, single-play I'd get uncomfortably motion sick after ~20-30 minutes. Enough that I never really played the game much in single player.