Wow, what a thread! To think I started it in all innocence...
I guess my big question is why you would EVER end up in fully developed VRS, other than for demonstration purposes. Same as a spin in fixed-wing.
I've had exactly one case of unintended IVRS (HOGE in an R44 close to gross). I was out of it in a heartbeat - unintended but not unexpected!. Seems to me that whenever you're HOGE you're spring-loaded for IVRS. It's hard to imagine a situation where you'd get IVRS and not recover LONG before it turns into the real thing (though I did see the post about the ham-handed student).
Sideways recovery would make a lot of sense if you were say nose-in to the scenery, like the tour pilots in Hawaii showing the waterfalls. But even that isn't Vuichard, just moving the disk out its own shadow in a different direction. If I understand correctly, a key part of Vuichard is pulling MORE power.
So to all you experienced heli pilots... why would ever be in developed VRS in the first place?