It also enables super easy workflows. To give an example, consider working on a fork of a project from GitHub. You clone the project from its source and make some changes and commit them. Where do you push the changes? You make a fork on GitHub. Go to magit, press a couple of keys to add a remote, name it the same as your GitHub username, magit automatically sets the URL correctly.

Now you realise you've put those commits on your new master branch but etiquette says you should put them on a separate branch. A couple of keys creates a "spinoff branch". Magit automatically creates a new branch at that point, sets the upstream of that branch to the old upstream (e.g. origin/master) and resets the old branch (master) to its upstream.

Now because your remote is set as "push default" you can easily push to it. Magit will now show you if upstream (the other remote) has diverged which means you press a couple of keys to rebase on to upstream then force push to your fork.

And this doesn't even mention things like doing an interactive rebase. Magit helps immensely there. The diff "dwim" is useful too. The list goes on.