I have never understood this. Back in the days before svn was entirely obsolete, I tried TortoiseSVN and found it confusing and difficult to use, especially when compared with the command-line where everything I wanted to do was trivial - both more obvious and far quicker than wrestling with the GUI.
Is it just for people who will always consider a GUI easier than a CLI, no matter how complicated the GUI and simple the CLI? Or is there just some complete disconnect in the way my brain works compared to the target audience? I find a lot of these GUI 'simplifications' so hard to use that I almost feel embarrassed to admit it.