Addendum: I think with your last image you're close.
I didn't phrase my response very well. It's not that it's "wrong", per se; but it's just such a specialized subset of what can be done. I've heard people complain "why spend $1700 on a tilt-shift lens for THAT?" and they're right - those miniaturization effects can be achieved easily with an inexpensive Lensbaby.
When I think of tilt-shift lenses - and why I'm hoping to eventually buy one of the new Nikkors - I think of taking advantage of the Scheimpflug rule, and also about perspective control.
I'm in total agreement with you here but is it true that the Lensbaby can do this effect? These "fake miniatures" is actually an application of the Scheimpflug rule, just that the lens is tilted the "wrong way". In that case, the Lensbaby would also be able to extend DOF by tilting in the opposite direction- but I think it is only capable of blurring the focus around a movable point, not actually changing the plane of focus.
I'll offer up one solution, though. If forum members wish to donate $1700 to me, I'd be happy to resolve this by testing the Nikkor 24mm f/3.5 PC-E lens extensively.
I'm not sure what your style of photography is, but even if somebody gave me that lens for free, I am not sure I could find a use for it every day.
PC lenses are very cool, and I am always more interested in putting together a photo at the point I press the shutter release (instead of in PS). I look at images like this and this and acknowledge the coolness factor, but I just feel like these are very deliberate. I am not sure I could look at either scene and say "I wish I had my PCE."