After some practice I have found that it doesn’t take much extra time, and you can see subtle differences looking at the before and after pictures! Is it crazy dramatic or will people stop me on the street and say “Wow! That’s some killer contouring and highlighting you have goin’ on there!” No. But do you really want that? I don’t.
A trick to mapping your face for contour and highlight is to take a picture looking directly at the camera (like I did) and study to see where you need more definition or where you want to accentuate. Then play with products to find what looks most natural.