We have some team members who aren't so command line savvy(don't ask why). I recommend source tree to them and they are quite happy with it (which means others can work without interrupts). It's a decent app for basic/everyday things.
* Shameless plug * We are working on app that aims to make collaboration with Git extremely simple. It's targeted towards people like your coworkers. Essentially, the idea is to forget about the complexities of version control and to just focus on your work. You can learn a bit more here: http://gitpilot.com
