I'm subject to NAS like most of us here, and of course I'd shoot 36mp (or more) if I had them. But realistically, I've had less than five circumstances in the past two years where I really needed more than 12mp. Granted that I haven't done much birding in the past couple of years, but on the other hand I've been making bigger prints too.
I've also come to realize that I'll almost certainly improve my results more by spending $3000 on workshops than if I spend $3000 on a D800e - and likely by a WIDE margin. It's pretty clear that I am the limiting factor in almost every aspect of my photography.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!