I hated 3D movies at first. Then I watched Edge of Tomorrow twice: first in 3D and then in 2D. I stopped noticing that it was in 3D partway through the first time. When I watched the second time, I noticed a significantly muted emotional response when viewed in 2d.

or maybe it was cause you were watching it a 2nd time and you knew what was coming. it's not really a scientific experiment after all. Nothing wrong with opinion tho.

Likewise, stereo 3D 'works for me'. It just seems to be one of those things with high interpersonal variability. You might as well declare that pineapple on pizza "doesn't work and never will."

Speaking of high variability, there's a particular issue I have that I've not seen come up before.

The Nintendo 3DS has a 3D slider, that lets you adjust the intensity of the 3D or just go 2D. I can handle it for extended periods on the low setting, but have stopped using it entirely after one session where, upon putting down the game, I couldn't handle reality. It was like my brain had adjusted to the incomplete 3D effect described by this post, and the real world suddenly physically hurt to look at. It only lasted about 10-20 seconds, but it was more than enough for me to not want to use it again.

I've seen 3D movies and they've always given me motion sickness.

I'm not a fan of feeling sick at the theater.

Same here. It works great for me, and I prefer it whenever it’s an option.