How To Create Printer Spreads PDF for Saddle Stitch Booklet?

I like, "scores of variants"... Is that an impositioning pun?

I'm under no illusion of just how complicated impositioning can be, having spent a few years on press at Cadmus in my youth... But, for basic needs like docs without complex crossovers, or assembling mocks, or dealing with printers (or projects) that don't have tighter requirements, it does seem like a lot of headache and hoops to create the most basic and simple of imposed spreads. My supposition is that perhaps it is assumed that it would be too easily an abused tool... Still, given the level of assumed trust in the competence of a given designer using a pro layout tool like InDesign to make those choices as they deem fit with projects, I would hope that isn't the reasoning. It certainly wouldn't stop someone from making just as grave a prepress mistake as in a myriad other facets of layout that are normally better left to the printers.

Oh, and BTW, not to be misunderstood... I would rather not have to do impositioning work. I really really wouldn't. But its not always up to me unfortunately.