I used to be a cli proponent and it worked very well for moderately sized, hardly dynamic repos; for other repos that can see dozens of commits an hour it's much easier to use a GUI. I use it for easier rebasing and cherry-picking, because I can directly see what I'm taking and where I'm putting it, instead of having to first check the log, then copy the hash, then paste it with the right git incantation.

Sometimes using the mouse really is more powerful; sometimes it is not. It is important to see that it can sometimes be your friend.