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A PFD in cold water is like a motorcycle helmet when the rider wipes out while at high speed: It won't neccesarliy save you in the extreme circumstances, but will make identifying the body a lot easier.
You rely on the device to do the job it was intended to do: keep you afloat, face up.
What ends up happening is that people presume that a PFD will do MUCH more than what it is supposed to do.
How often do you hear about people succumbing to hypothermia, and the survivors always tend to say the same thing: "But he was wearing a life jacket...." as though they magically create an insulation layer just because the person had it on.
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