I'm a big fan of issues and milestones, but what features is your team using on the project, if you're using any? If not, why not?
With all of my projects, I feel like the answer is not enough. Git has so many good features, but I find issue tracking the most helpful. Without some place to keep track of things to do, I find I can't keep track of them.
I should use more of their services, but the basic push/pull functionality is so nice. After using just the H-drive in previous classes, its a freer feeling being able to work anywhere and be able to easily access your work post-college.