Incidentally, if you start doing some research into physics education, you'll find that one of the biggest problems is that students enter physics courses with a horrible set of pre-conceived wrong notions about physics principles. Requiring students to draw these diagrams is one tool used to help alleviate the problem. Great, you're one of the students who doesn't need them. I'd bet that they benefit at least half of the class.
In my first few years of teaching physics, I went to a physics teacher's institute. I kept questioning, "are you kidding me? Everyone knows that." And the profs looked at me and said "yeah, you're probably right." Later in the course, we watched videos taken shortly after the graduation ceremonies at 2 ivy league schools (Harvard and MIT?) I watched with complete shock (and in the corner of the video, there was a window showing the shock on the professors faces) when engineering graduates didn't think it was possible to light a flashlight type of lightbulb with only 1 wire and a battery. There were engineering students with no f'in clue what "complete" circuit meant. And, the number of graduates who thought the wires on each side of the filament in a lightbulb both went to the point at the bottom of the bulb was staggering. Congratulations to your prof for making sure the students understand the problems.