The local sports talkers where I live kept bringing him up whlie talking about this subject this morning. The general gist seemed to be that, back in the good ol days, guys like Nolan and Luis Tiant would throw upwards of 200 pitches a game, which was good for the game, while a great pitcher like Kershaw can't go 80.
Setting aside the context (again, early in a season with an abbreviated spring training, guy coming off major injury), comparing anyone against Nolan Ryan in terms of longevity seems a bit much.
Either way, as you suggest, the perfect game thing is definitely represented by a lot of pitchers who aren't great. I honestly forgot Phil Humber and Dallas Braden both threw one until DD/JP were talking about it on yesterday's broadcast.