I guess 'large' is really a function of number of developers and rate and diversity of commits. I've been in a few situations where two or three of us were put

I guess 'large' is really a function of number of developers and rate and diversity of commits. I've been in a few situations where two or three of us were putting out several changes to the same piece of code rapidly (typically to meet a deadline). Git has proven invaluable in untangling some of the knots we've put ourselves into in those sorts of situations. If commits are coming in slowly, with plenty of notice, and everyone is working on different parts of the codebase, then you probably won't need to do much fancy stuff very often.