> And Storyboards are certainly in principle a cool idea, but I've never seen a production app that has actually used them

Fly Delta app uses them all over the place (first-hand experience) - they're fantastic for static cell table views. Admittedly, merging them can be a HUGE pain, though.

> As far as I know, Apple aren't dog-fooding them in their own apps either.

From what I've heard from an Apple engineer, Apple doesn't dog-food a lot of this stuff because the tools either don't exist yet by the time they need to ship or aren't stable. A lot (most?) of their apps end up being done programatically.