"But - and this didn't come as much of a surprise - these guys are so good they adapted pretty quickly. They can't quite do what they used to do from the rough, but every player is different."
Key word: quite. Which is precisely why the PGA Tour is already going back to pre-groove-rule-change rough heights of 3 or so inches (see Torrey Pines). The reason cited by the rules staff? Lack of impact by the groove rule change.