I frequently hop between Spain and the UK. Self-checkout is ubiquitous in the UK and people seem to almost universally favor using it, manned tills are a minority and generally reserved for larger purchases. In Spain it's quite the opposite: manned tills are a majority and people _actively_ avoid using self-checkout, even when it means going through a much longer queue.

I found it an interesting cultural difference, and I can't help but wonder to which extent it's influenced by the preference for human interaction in both countries.