Like the OP, my other camera body is a D300s. With VERY similar controls and physical layout, it's easy to switch from one to the other.
I also have a D70, which I will eventually give to one of my kids if they show some sort of interest in photography (not so much yet). And for times when a DSLR is too big, I have a Canon G15 (don't tell the management).
I view the notion of keeping commonality of controls as a strength for Nikon, so I hope it continues with a D400 that has controls similar to the D300(s), and the same, substantial size, feel and build.