Gotta disagree my man. I think the "1 hour and out gig" has become so written in stone in recent years thats its become cliche. I am by far from being a volume guy btw, as many that know me here are aware. However, on back or leg day, I'm there easily for 75-90 minutes respectively. Much of that time is spent resting between bust ass heavy sets on exercises that expends alot of oxygen, ie, squats, deads, leg press, t-bar rows, bb rows, etc. I might rest 6-7 mins between heavy sets so I can come back recupped so I CAN use heavy weight. Show me someone resting 1 minute between sets of squats or deads and I'll show you a guy that could be using a shitload more weight.
I certainly do agree with you that marathon workouts are not the way to go. I'm just sayin' kickin' it for more than 60 minutes isn't wrong. A guy resting little may do 30 sets in that time, a guy resting much might do 8. The time period there isn't so much as important as whats actually getting done.
If they can, they are 1)severely limiting the weights they COULD be using had they rested longer on the bust-ass worksets of squats or leg presses, or 2) half assing it on leg day. Hell, I spend 30-35 minutes at the squat rack alone. Much also depends on the weights you're using. A guy maxing 300 on squats doesn't need to spend near as much time with as many warmups/feel-sets as a guy maxing 600. 
Another thing that pisses me off is assholes who read books between sets holding up shit.
