Interesting - I've only worked on pretty small eng teams, but I couldn't live without git blame (or an editor/IDE feature using git blame). It's like another dimension, seeing the history of code line-by-line and learning why it was added, especially if those lines are months or years old. With clean linear commit history and clear commit messages you can easily see not just what was changed, but why it was changed, along with other commentary from the author and often a test plan.