I mean I would, but then I look over and see that the self-checkout is nearly empty and you're holding a single coke in your hand and I'm thinking: 'no'
If there was an empty self checkout, I sincerely doubt anybody with one single item would be standing in line behind you & your cart full of groceries.
I do this when I’m not in a rush. I do not do it for entitled people who expect it. That is where it stops being wholesome and an expected chore. It also helps when there are express lines as there can be a lot of people with just one item and one day I would like to leave the store.
Not in the off licences, no. The one by my house is quite large and well stocked so I do most of my grocery shopping there. They have two tills and usually only one is manned. Only if the queue starts twisting between the shelves, someone temporarily fills the second till. I've ushered people to pay before me many times.