I've never played Merion, and probably never will, but I absolutely love the course and I'm not that far from loving the setup by the USGA. The US Open has always (in my lifetime) been about creating a stern, punishing test. In my opinion, I like seeing the pros struggle to find fairways and deal with scary-fast greens. Would I want to see that all the time?...no. But I have no problem with the USGA narrowing the fairways and growing the rough. The course belongs to the members, not us, so if they are okay with the USGA implementing the setup, who am I to criticize?
As for Zach Johnson, sorry, he's just bitter that he struggled and missed the cut. Would be be complaining if he was atop the leaderboard? Does he criticize ANGC for manipulating their course? I haven't heard him say anything openly. To say that the USGA manipulates a course but not to call out ANGC is, IMO, the height of hypocrisy.