Depends heavily on team. Almost all of my teams have been quite social, with a lot of office banter and regular lunches and social activities together. I was in today, with about half of my team, and we had plenty of non-work conversations and a nice lunch break at Backyard Barbecue (now open as of this week!).

This may be because I'm a middling-social person; I'm an introvert by nature, and don't mind long stretches of alone time, but I can also hold a conversation about non-work topics. All it really takes is two extroverts (or at least reasonably friendly people) on the team to change the dynamic.