Seriously, the more complex your use case is, the better the command line gets.

Personally, I use mostly command line git and on occasion a little bit of gitk if I get lost between all the branches. I die a little (read: a lot) inside when I have to help my team members with git and they adamantly stick to TortoiseGit. It's a prime example of the UI improving discoverability at the expense of performance (and even then the individual actions tend to get lost between all the numerous possible actions).