The "iOSification" of OS X is overblown hyperbole at the moment. Yes, Apple's simplified some of the core apps like iPhoto. Yes, Apple's made the Calendar app fugly. They added the "Launchpad", which you never have to actually see unless you invoke it, and they added the Gatekeeper security feature, which you can switch off with a few clicks of the mouse.
They also recently got rid of the guy who was responsible for some of that stuff, so we may see a roll back on the nasty skeumorphic nonsense.
The core OS, and its UX in general, are still excellent, and every single app distributed outside of the App Store still have as much freedom as they used to.