It is what it is...it's gone–just like No Color Management from the Print dlog...deal with it. It won't be coming back in it's current incarnation. And while YOU say setting it up correctly isn't rocket science, I would venture to guess that prolly less than 5% of the installed user base actually knew how to do that (people here perhaps being in that 5%).
Viewing the photo in print size wasn't mean to have a good rendition of it. Sharpening boost is set with 50-100-200% depending on the needs.
That feature was useful when needed to review the layout of the photo at a certain size, the print size. Some photos work well when printed big, for smaller prints you may need to crop more so that a particular detail doesn't get lost. Not the easiest concept to explain, but it is. This is true even with prints which ar way bigger than the monitor itself.
I do miss it into Lightroom!
As other said, Photoshop CS6 lives thanks to features that 2-5% of the users need. Maybe 5% of PS users knew how to set it up, but 80% of those who needed that "zoom level" knew it. Who cares about the rest of non-users?
If you are worried about exact layout, size & position, may I suggest you look into InDesign (since that's what it's designed for).
…or even better an older Photoshop, or even Photoshop Elements.
To buy InDesign to view an image as print size is as questionable as buying Photoshop Extended to convert a JPG to PNG for the web.
This unless Adobe gives you the product for free, but I'm not that lucky.