I think they key to me is that it is really just helping you write git command lines. The menus are laid out exactly like the options of the relevant git sub-command, so that using Magit makes you more proficient at the CLI and vice versa. Other GUIs (including the awful ones that tend to be built into editors and IDEs) are instead hiding these details from you, so that if you are proficient at git on the CLI, you are still starting nearly from zero with the new interface and vice versa.