Don't talk to me though, while I am trying to do focused work ...

Or other people who are really busy right now, but in general yes, most people enjoy random interactions and talks. And most people do have interesting things to share. You have to have genuine interest, though. Don't force it - but be open for it. Make eye contact first and then you might connect. It is astonishing how many grim looking people suddenly start to smile and act friendly, if you just start a friendly conversation with them. Even if it is just a exchange of a simple comments.