Shaving kind of sucks, but no way I can afford any means of permanent hair removal at the moment. It was really awful in the beginning. I had a beard until I was 26, just because I was scared of dragging a razor across my face. Luckily, once I finally tried it, it wasn't nearly that bad, but still... Like the OP said, irritation, cuts, and I just wasn't very good at it in the beginning. My technique has gotten much better over time, though. No more irritation, very few cuts, takes less time and I can get a closer shave. The shadow is still somewhat visible, though. That's the curse of having black hair and light skin, I suppose. It also means I have to listen to people gush about how I've got the perfect combination for laser. Yeah, if I had the money to spend on it. *sigh* For now, I'll just have to deal with it the old fashioned way.
But back to the original topic. I'd imagine a ton of cis guys simply don't know it's an option. Maybe the cis guys in other places do. Not the ones where I live, though.