I don't know about most other folks, however I engage in an extremely wide variety of types of photography. My full-time job is wedding and portrait photography, but also include commercial and editorial work sometimes. My hobby, though, is landscape photography, astro-landscape photography, and timelapse photography.
I therefore have good reason to use both 14-bit and 12-bit NEF, depending on what I'm shooting.
I can fit 2500-3000 raw images on a 64 GB card if I use 12-bit and compressed RAW on my D750, which is highly convenient for getting through a 15-16+ hour Hindu wedding day!
I also use 12-bit and lossy compression when shooting 10,000+ images on major adventures for timelapse photography, since each raw frame is only going to wind up being 1/30 of a second in a single timelapse clip.
For many other things, including serious landscape photography of course, I use 14-bit lossless NEF.