This is true. However, the 'portals' (the doors ) to these interiors are different. Thus it is most likely that you cannot meet each other if one enteres the Burger shot in SF and another enters it in LS. They would be in the same interior but in another 'dimension'.
I could be wrong though. And should I be wrong, then indeed it is very easy to meet up with people, because you do not have to travel all the way there.