Camera Raw's compatibility indicated that the P6000 was indeed a camera supported in Camera Raw, but even though I had the latest update, it was no good.
Finally I figured it out. If you just rename the file with .NEF as the file extension (because that's the file format of all the raw files from every other Nikon, like my D700) all of a sudden you can open the formerly .NRW files in Photoshop with no problem.
I have to say, apart from this mild panic and frustration I am very happy with my P6000. I think the reviewers were all too nit-picky. it's good.