As much as I like self-checkout, I find the opposite is true, and it gets worse as the number of items increases. Most people are generally pretty slow scanning items as they struggle an extra second or two to find the barcode. It's great for express checkouts, but not for people that have a cart full of items.

Additionally

- You can keep headphones on and keep listening to a podcast without being rude to the cashier

- You can scan and bag stuff in an order that makes sense (e.g. so you don't get eggs at the bottom) at your own pace