Tinstaafl
I pretty much agree with what you say, though I think I have met some twits for whom even pressing the D-> button would appear to be an overly complex task.
However, I wouldn't dismiss GPS quite so outrightly. Certainly, if all that's being done is entering a D-> course and following the pink line, it's only a mater of time before the wrong waypoint gets punched in.
Alternatively, if used creatively, they can yield just as much information as the regular instruments and will provide for more accurate navigation too. For instance, in the run that I do, it's a while before I can tune in the VOR, but I can use it as a waypoint immediately with GPS. When I do get the VOR, I need to stray a fair old bit off course before the needle starts to register it, with GPS, I know exactly how far off course I am at any moment. I can use Bearing vs Track to stay on course which would be more trial and error on the VOR and I can plan ahead by using distance and time to waypoint to plan the power stepdowns to cool the turbos. I can even use the NRST feature to see how close I am to our local prohibited airspace.
Now I could look out of the window for some of this as well, and I do. I also use the stars (ok, only if I'm heading north). I could also use DME and RNAV, but not everything is so equipped.
Anyway, it's a moot point as it'll all probably be GPS in another ten years and they'll only cost fifty quid (and not just from a bloke down the pub either).