I hated the original self service checkouts that came in years ago, that shrieked stuff like "unexpected item in the bagging area" if you so much as breathed in their direction.
Then our local Tesco introduced scan and pack, with the hand held barcode scanners. Like that you can just scan the item, pack straight into your own bags and get a running total as you go around. I started using those and have hardly used a manned checkout since.
I also use the other self service checkouts occasionally now that you have the option to pack straight into your own bags, but still don't really like to use them for a big shop as the packing areas still don't seem quite big enough.
There is creeping automation in all areas of life. You can try to ignore it if you wish, but you'll be battling against the tide. It will happen anyway. Making a stand like that is a bit pointless really. You'll just get left behind.