You do you, I'll do me. One cashier scanning, one of me emptying cart, and if I'm lucky there is a bagger as well. Aside from trivially small purchases (one or two items), this is substantially faster than self-check and self-bag if you have a lot.

Even with lines, usually faster in the human-run checkout.

If you want faster lines, find one with only men in it. Men usually aren't the main grocery shopper in the family, so they're usually buying less, and usually aren't dealing with rambunctious kids, so they can focus on unloading and loading groceries. No purses either, so the credit card is usually in the machine right away.

I've pointed this out to my wife a few times and she simultaneously curses her fellow women and grudgingly accepts that I'm right and uses the logic. She's quite efficient, but I have to admit that if I saw her in line I probably wouldn't get behind her if she was smiling. (If she was wearing her resting bitch face, probably fine - typical sign of professional women who aren't inclined to spend any more time than necessary in the grocery. You find a woman in a pantsuit, she's probably faster than most men.)