I went from a 7000 to a 7200 and see a ton of difference. I had pretty much convinced myself that I was going with a used D700 and even found one to buy and noticed the d7200 was released. Sure it still has things I didn't like about the D7000. Size, build quality, small viewfinder, a few missing on camera controls etc.
What it did deliver on was what I wanted to see in a d7xxx upgrade: Sony sensor, Expeed 4 processor, deeper buffer, much better AF system IMO, low light AF and better high ISO performance.
My only complaint was that I had to shoot RAW+JPG for a while until I had a version of LR that supported the RAW files. Its a fun camera to shoot and like I said focus is really nice on this one. Misses are a rarity now compared to the D7000 where I had 15-25% on bursts of moving subjects.