Welcome to the debunked myths of helmets, and why people mistakenly don't wear them.
Coming from a guy in a no helmet state. I like my full faced modular for many reasons. No wind in my eyes, at least compared to glasses, never tried goggles. No bumblebees smacking my mouth and making my face numb. After cleaning bug carcasses off my helmet, I now know what was on my face. I have the built in drop down shade, which is wonderful and that alone is worth its weight in gold. And since I have the modular, I can flip the entire thing up for long stops, or while I'm doning gear/backing out of my carport, etc, talking, smoking, drinking, while filling up gas, etc. I've seen pics and heard first account stories of face damage. I'll never NOT wear a full faced. Perhaps parade-type things. Also wind noise is reduced, which is a long term consideration for hearing loss. I'm already half deaf from the Army, I don't wanna wear a hearing aid when I'm 45.
And you're entirely right. These helmet guys know what they're doing, its human anatomy, you cannot see with your peripheral vision the sides of the visor. The only way you can is if you turn your eyes fully side to side, then you barely catch some of it. And of course, riding 101, turn your head, not your eyes.
Cracking it open one click clears the fog. When those conditions are out, usually its only a problem at stops, as soon as I take off I can close it and the fog stays gone... till the next stop. I also do it when its hot out, at stops, but then its usually fully open, and I close it after taking off again.
Go to your helmet manufacturers site on their care section regarding anti-fog stuff. Keeping up with re-applications on a helmet is too much work for me. Cleaning bugs off the outside isn't bad (but I'm lazy). But even removing the easy release visor on mine to wipe the inside clean is asking much. (cause I'm lazy)
Even then I think the bug mess is gone now that I have a windshield, well, transferred to the shield.