Germans may not ever master standing in line, but they are undoubtedly masters of the “general melee”.
Whether you are patiently lining up at a bank, or store, a German will wander straight past the three or so of you, stood orderly and patiently up to the general area of a desk and destroy all notion of a line.
It is actually similar to being in a crowd at a music gig. I have been to hard rock, punk rock, indie rock and electro rock gigs all over Germany and my experience is largely the same, everyone stands in a general melee, facing the stage (well, obviously) and between songs, they will clap. But, save for a TINY portion of the crowd, Germans at gigs are largely motionless and spread out. It’s like they are applying similar ideas to that they apply to queuing.
To be honest, I am still not used to it, being in a rock concert venue that holds 2500 people and getting more order and room than if the same amount of people were in the post office.