I agree it can depend on what you want the camera for and what you shoot with it. There are people shooting quite happily with the D40 and producing fantastic photographs and have learned to work within the limitations of it, for their respective types of photography.
Like you, features like video are of little interest personally. For me, the ISO would be one of the most attractive features of the D7000. Not so much in the range but, more on how the camera handles the signal to noise, as I shoot indoors quite often and don't always want to use the flashgun to get the shutter speed up. Although the D90 is a great camera, When you start pushing the ISO up above 1600-2000, the noise becomes increasingly noticable and post processing doesn't always remove it.
I watched a video of the D3x a few weeks back. Noise wasn't even detectable until pushing past 6400 ISO. It will be really interesting to see what the D3 models replacement will be like in terms of low light capabilities, as well as the D800.
Ergonomics are something that I have come to think people fall into a trap of to some degree. While its nice to have something in your hands that feels familiar, you have to ask, is it essentially because of muscle memory and what we are used to?
When I switched from a Kodak compact to my old Olympus E-510, it felt completely alien to me and it took a while to get used to it. Then 6 months later, when I got the Nikon D90, I couldn't get to grips with it initally. It felt bulky and huge in my hands, the buttons were in different locations, the menu system completely different and there were god knows how many extra features that I had never even heard of lol. Then I added the battery grip, making it even heavier and bulkier still, which required a further period of adjustment. Now, I'm completely at ease with the D90.
I guess the point I'm trying to make is that we adapt, even though its initally outside of our comfort zone. I'd much rather have a camera with technology that enabled me to push the boundaries, that took me a few weeks to get comfortable with, than a camera body that has greater limitations.
The K-5 looks to be a great camera too. If it gets too heavy, I may have a Kodak compact I'll swap for it lol
Take care,
Aaron