One way I enforce the review of my own commits in my own work flow is not using the CLI for committing. My git client shows me the difference in the status window and also when writing the commit message. Then also making it easy to stage specific junks without having to go down the add -p route. I personally use magit in emacs but I'm sure gitk and some of the more graphical ones have this ability. Not to say any of these don't exist in the CLI, the ergonomics are just not the same as getting the output of multiple commands in a single well designed interface.