FWIW, I don't often encounter diff output in my day-to-day computer usage, but when I do, I do not find them very intuitive to understand. A bit of UI magic would help here, it's not the concept that is hard (for me) to grasp, just all those lines with +'s and -'s and figuring out the contexts in which they apply. It's always a bit of a puzzle, especially if, for some reason, it's not highlighted with colours.