Comment by brianpan

The diffs are the biggest reason I use it (beside the 3-way diff, I can't live without: blame, optimize imports, all the editor functions inside the diff, diff files/commits/branches).

Beyond that: separating into change lists (staging changes by line inside a file) and the graphical presentation and filtering of the commit history (highlighting what commits are in/out of your branch, show the git history of a section or line of code, show repo files at a commit)