I find I always use self check-outs when available. I know, I know! Horrible of me. Start the boycott of my services. LOL.
I just find them faster, easier, the lines are less, you don't have to deal with annoying people who 20 have thousand coupons, all on their phone and the cashier has to look at each one, the phone is going back and forth, grandpa thinks debit cards steal your money so he only pays in cash and today was coin day so he has to pay for his $50 purchase in quarters.
I deal with people all the time, in both my jobs. When I'm on my own I just want to be left alone. I want to get from A to B, get my shit and get out.
I wish some places would upgrade and get tap though. Would make the process even faster. Don't need to carry a wallet, just my phone or my watch, pay with a tap - easy.
I'm an honest shopper too. I don't scam the machines and I pay for bags if I happen to forget my re-usable ones.