I shoot a lot of pictures. I have Nikon gear due to a chance decision back in the film days after my Pentax K-1000 was stolen and I replaced it with a Nikon FE. With product lock-in, I'm still a Nikon user, although both dSLR bodies I have are a decade old.
Outside of macro and wildlife photography (basically, extreme closeup and extreme telephoto), I tend to use my phone more than my dSLRs. It's smaller, more convenient, and the pictures it takes are 70-80% as good as I'd get on my heavier gear. Well, there's also an annual parade I shoot where I want to be able to control depth of field and trigger some strobes, and I use the dSLRs for that too.
I've been eying a body upgrade, but I can't really justify it. Having one crop sensor body and one full frame, I'd rather spend the money on new, fancy lenses. And the computer-designed lenses really are incredible. I have an 28-300 lens with vibration reduction that is frighteningly good for the range it covers. It has some distortion, but nothing that's not easily corrected in production. And it's very nearly as sharp as some of my pre-autofocus primes.
It seems one of the problems that Nikon (and the other manufacturers are facing) is that the quality of camera gear is just incredibly high across the board. I could spend a few grand to get a body with an extra stop or two, and a bunch more pixels. But I can hand-hold a modern vibration-compensating lens at 400mm down to somewhere around 1/100th of a second and get good results. I don't print large, so I don't need more pixels. Why spend the money?