I get the sense that there are some folk still actively using CB, but I also have the sense that for most people, their needs are better met nowadays by GMRS radios (which are in the UHF/~70cm bands, rather than 11m CB), which provide for legally higher power transmissions, at the cost of a nearly completely unenforced license.

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.