If your brain doesn't like high refresh rates, just ban them from your environment. You can always disable MCI or whatever the 120Hz mode is and enjoy regular 60 Hz on the fancy TV.
The interesting thing about 120Hz is that the picture is retraced twice as often than at 60Hz, which is a great way to eliminate ghosting. It's great for games too because it lets you actually play at 120fps, while 120fps at 60Hz is basically 60fps (the display can only show up to 60 different frames every second, even though the system may actually push a lot more).
120Hz does not always feel right, though: most movies look better with a "natural", slightly blurry transition between frames. So you're entitled to hate it
