Some interesting comments made.
Personally I enjoy navigating with paper map and compass, because I find it more of a challenge.
In the past, I've enjoyed testing my skills in more remote areas and in poor weather on solo walks, gradually making routes more difficult.
But carrying the GPS and knowing how to use it has given me the confidence to be able to do it.
Knowing if I get it wrong on the map, my GPS will bail me out.
Yes I agree your head isn't in your map every couple of minutes using a GPS, and this would allow you to admire the views around you, check out the wild life etc. and that in itself brings satisfaction, and pleasure, I know because I've done it.
However I think from map reading, you're looking at those same views but in a different way, noting the terrain and everything in it when map reading becomes some how, more important and therefore you become more aware of your position.
And so when I do get it right, under whatever circumstances arise I'm rather pleased with myself
But it's thanks to my GPS I Have done it
I guess it all comes down to what an individual wants from a walk