Who didn't?
Me. I don't consider downloading the free version of CS2 and registry key Adobe recently put up on their website piracy. However I've hardly ever used it. Total overkill for my needs. Paint.Net and that other program with the ridiculous name are fine for all my present graphics needs.
But yeah, Photoshop's popularity owes as much to the ease of pirating it as it does to it's killer features.
I get the feeling the CS applications have matured, and there aren't many new features being added, so the amount of people upgrading regularly is slowing, which is why Adobe is switching to a subscription model.
It could work out for them. Autodesk went subscription years ago and are still making money hand over fist. Although you can still buy Autodesk products, just don't try selling them second-hand, or expect product support.
EDIT: of course with AutoDesk the yearly subscription/lease works out cheaper than buying a new version outright yearly, which doesn't seem to be the case with Adobe Creative Cloud.