We only have them at the WalMart. My daughter had to show me how to use them the first time, lol. I was intimidated! But now, even with a full basket, I prefer self checkout over standing in line.
Things that bug me about standing in line.... Those pushy people behind you that crowd your space. Like, umm, the line will not move any faster because you are standing right behind my head, get back!!
Having to place all of your items on the conveyor and feeling like people behind you are checking out what you are purchasing, haha.. I can't take the judgement.
Trying to pay for things on that little scanner but the person behind you already has their cart in your way, so everyone has to move back so you can pay for your things.
The checker putting one item in a bag. You wind up with 10 million plastic bags when you get home (no, I still have yet to buy reusable bags, too cheap).
The other thing I like about self checkout is I can place items in the bags together that makes it easier to put away when I get home... frozen with frozen, fridge with fridge, pantry with pantry. The checkers don't care or know how my house is set up, I do.
Just my .02