We don’t really mix that much though. I’m from the French speaking side, when you live there you basically don’t go to the German or italien speaking side outside of vacations or specific events (also, transports are really expensive, that doesn’t help). And for young people it’s common to speak in English as an intermediate language between regions. I can also say that I had a decade of German courses in school and got absolutely nothing from them.

The experience is a bit different if you live in a bilingual canton but people are still mostly speaking one language.