Interesting thread, and I did learn something that I didn't know.
In the old film days, each shot had to count. In this, the now well developed digital era, where you have a delete bottom and nobody is keeping score, I do find it fun to play around with settings to see what I get. That was my 'training wheels' comment point, that it's really OK to play around and experiment. Nobody gets hurt, no animals are harmed, no film is wasted and sometimes you get most interesting results.
I do particularly enjoy playing around on the D600, and it's not like back in school - there's no one, right answer. Thanks for the education on what P does, though. This Nikonians Forum continues to amaze me with the depth of knowledge and generosity with that knowledge here. The D600 was announced, and bam, a bit over a week later we had it to play with - no How To books, no cheat sheets, just one Owner Manual, which few ever read and never a model of clarity anyway. This D600 came ready for experimentation. Long ago, in my F3 days, I asked an old photographer what all the settings (far fewer than now!) did and whether there was some kind of carry along cheat sheet, and he just laughed and said, 'keep playing around with it, and you'll get it!'