It would depend on how/why they died and (it seems) on Amy's memory. In the case of Amy's parents, the answer is Yes.
Amy's parents hadn't died, they'd been erased from history. And they only came back because Amy made a special effort to remember them. The Doctor made sure to tell her to try as hard as she could to remember them, otherwise they wouldn't come back.
So, no, it doesn't mean everyone that died came back to life. The universe that came back was mostly the same as the universe at the start of "The Pandorica Opens", except as modified by a handful of things that Amy specifically remembered.