Brian: I wasn't dissing the importance of having comparable control layouts between cameras you switch between everyday. That is one reason why the D600 really appeals to me. That is what I meant by "workflow". Maybe I chose the wrong term - should have said ergonomics, maybe?). Also, I can appreciate the desire to have an AF sensor exactly where you want it, especially in landscapes and portraits (then again, you can always lock focus and recompose).
But, there are a lot of faux-pros out there who feel more like a "real photographer" with that big heavy pro-layout DSLR in their hands. They are mostly the ones still hanging on to the D300, with it's mediocre high ISO performance, years after the D7000 has proven to produce at least 2-stop better images in low light. I suspect that some of them will be the same ones that hang on to the D700 as well.
The D600 makes a great FX companion to the DX D7000, if you want one of each, just as the D800 makes a great second body to the D4.