I agree there's an adjustment in shooting style - I had to adjust to the D7100: controls in different places with different functions etc.
I just find the comments made in this thread about "having to settle" a bit strange as no camera is perfect, and in fact we all "have to settle" on what ever camera we choose to use.
If the new D400 is ever introduced and is built with the same physical properties and chassis as the D200/D300?D700 some could say a person would "have to settle" for an over-weight and bulky camera regardless of the advancements that it brings. . .Or they will find some other reason not to prefer it as the "ideal" camera. . .