Ten minutes:
I just stuck all the above Samsung Apps in a folder called Samsung Stuff and ignored them. Had to go to Galaxy Store to stop Samsung app update notifications. Bixby took about five minutes to learn to disable. Samsung Pay kept popping up for a bit but now doesn't. The side bar I disabled easily, but recently have given it another chance - it has handy screen and video capture and annotation tools.
Good stuff:
The (Chrome-based) Samsung Internet browser I occasionally use because it has some very handy features for web video, plus a battery and eyebalk-saving dark mide. Switching the Back and Task Switcher soft keys took no time at all.
Previous to this S8 I was using a Nexus (stock Android, obviously) and I don't mind the S8's Android at all. In terms of hardware, everything is as it should be whereas Samsung's competitors always seemed to drop the ball in one trifling area or other. Except the placement of the fingerprint sensor, of course.