I think there's some value in actually meeting one's teammates, but I've found that the collaboration I have works just fine if they know they can IM me to talk when they're having issues. I have lots of people from many different departments who just know what kind of things to IM me for. I don't always have answers for them, but I can usually point them to someone who does.

When I hung around in person, we'd chat with them about totally random stuff. You can learn from that, but it's not nearly as business-centric as intentionally talking to people about work stuff.