Really, wow I never felt that. I always put them in my bag at the natural speed. The only social pressure I felt was when paying before finishing packing. This lead to the next persons groceries being mixed in with mine and accidentally packing their stuff etc. Now I take my time and finish packing before paying to avoid this issue and it is all good.
well you tactic doesn't work that well in Austria. The peer pressure for slow people is noticeable (especially during busy times).
But that's one of the things I like about that. You take a cart - put everything in the cart and pack it into your boxes / bags afterwards and don't waste everybodies time. But this may be a very German thing to do.
You would be wrong. It's pretty much the same, the only difference is that you don't need to take off your shoes most of the time. However, opting out of the body scanner (where those are deployed) is a much bigger hassle than in the US.
Social pressure. You've just waited in a queue, and there are people behind you in that queue.