Thanks for sharing your views. I am vastly more impressed with shots from my D700 (and D3s) than I am with those from my D200, D300, D2x. I use them all in all kinds of lighting situations but most often I opt for FX. I find the autofocus to be sufficiently superior that I even use FX for birding and surfers even though I lose a little on 'pixels on the subject'.
As you, and others, have indicated there seem to be some intangible qualities involved in preferring FX over DX but those qualities are there nonetheless. The imnportant thing is that we each find what works the best for us.