[xmlninja]

Im mostly disturbed by the "most powerful" part because this is subjective to project and how you work. It's not a very common case for me to commit parts of changes in a file because in most of my cases all changes I do to a file belong to the same commit since I work with feature branches. However when I do need this it's indeed powerful but judging by the enthusiasm of the post and title it just smells like the endorphin release of new feature discovering.

[ryansouza]

Even with topic branches, I find staging with -p to be a nice chance to review the diff piece by piece. Helps me build good commit messages, and makes it easy to split changes in to a set of commits if I feel thats necessary.