Comment by kevinmchugh

I almost exclusively use add -p. It's another moment to review my changes and it saves me from having to type out the names of the files I've changed. I don't know if I've ever committed a file unintentionally since adopting it.

I like it especially in concert with git commit --amend, which lets me tack my newest changes onto the previous commit. (Though an interactive rebase with fixup is even better)