US here. Scan-as-you-go plus self checkout is amazing. Lay out your reusable bags in the cart when you arrive then pick-scan-bag through the store. Self checkout becomes a 2 minute process at most, no matter how many items you have and everything's already bagged for the trip home.

Our local store (Stop&Shop) is rather trashy compared to competitors but we go there because of the fast scan and self-checkout process.