Does the Galaxy 8 and 8S have notches?
No. They have small bezels on the top and bottom of the screen.
When they demoed a game and a video in landscape mode the notch was very obtrusive.
Nope, the Samsung s8 still has a forehead and chin. Lowbrow and underlung chin, but they're there. The optics, skeaker, sensors, and microphone occupy those bands. The notch on the iPhone X doesn't bother me. The side screen areas of the notch are used for battery gauge, WIFI or Signal and carrier info, etc, and don't intrude on actual screen data area. I think everyone will find it natural after a while.