I totally agree, I have an LG 4k set with 3D and I will still buy movies in 3D format if available. We have over 200 of them. The LG system works very well so long as you maintain 90-degree eye-level with the TV. If you are too high or too low you get ghosting. Though it has a dumb autodepth setting which is supposed to stop you from going cross-eyed. I find it is worse turned on (the default setting) than off and setting up manually.
I had the Samsung Set and that used shutter glasses which were horrid and strobed with the LED lighting or indeed daylight.
In a darkened room with dim non-flickering lights it was pretty good, but I wouldn't last a 3 hour movie without a break.
I also have a DLP Projector and that uses DLP-Link Glasses. It works the best of all, but I guess that is due to darkening the room. You have to mess with the LR swap button on the glasses which is a pain if the kids want to watch in 3D
It is a bit of a fiddle, but worth it if you put in the work.
The key to not feeling Ill is to get the depth right on the TV / Projector.
Your Eye's are used to seeing things at a certain depth at the distance. Re-create that with your TV and you won't get a headache or nausea.