There is still the nonsense of when you take advantage of a multi-buy (4 for 3 etc) where you can't simply scan one item and say x4, you have to scan the same item four times, and there's a delay of several seconds before the scanner switches on to allow you to rescan
Can't say I've ever noticed a delay of a few seconds, as soon as the scanned item hits the bag from being lobbed on it's way past the scanner, it's ready to go for the next.
We also have self checkouts in at least one department type store (clothing, housewares, toys, sports, office supplies etc....), KMart, they have basically entirely self-service checkouts, maybe one supervising checkout counter open. They also have the checkouts in the middle of the store not at the doors, which I always find weird, but anyway, I guess the advantages of drawing people though the store outweigh the potential for stock losses.