That's awesome, seems like a great contribution to the community. CB radio, too, that's not so common these days. I scan for it sometimes but never find any local traffic.
Part two of course is location: I'd expect CB to be more prominent on big cross-country highways; GMRS in wide-open country where folks might be overlanding. If you're hanging out in a city and expecting to hear either, I think you're liable to be disappointed.
It has a long wavelength. 11 meters, and that means it will propagate like "Short Wave" and HF (high frequency) commercial broadcasts tend to do.
The line of sight signals happen at much higher frequencies. VHF and higher. (GHZ)
They are all using SSB though I think. Not super common in handhelds.