I don't even think it's a power user thing. I think it's just a you thing. I'm a power user and although I did slow down using my iPad when I got my 11" Air, I didn't stop at all. It's still an hours-daily device for me. Mostly for Words With Friends, Twitter, and web browsing; the laptop's for writing code, making music and video, and most email. I also find the iPad superior for outlining, and if I'm doing a presentation without any live coding, Keynote on the iPad wins on convenience. It's also very handy to have two displays while hacking at a coffee shop, for the same reason it's handy to have two monitors on your desk.

It's even possible that for me buying an Apple TV bit into my iPad use more than buying an Air did. Not sure about that one, though.