It's called acting, dear boy.
Dunno. All this "I must do X to write" has always struck me as twee to the point of irritating. I have my preferences but anybody who needs their magic pencil in order to compose is looking for an excuse.
As far as the loading of paper, I disagree wholeheartedly. Banging through pages is an actual, physical process and loading a new sheet isn't much harder than hitting the carriage return. Not only that, but hey - there's a finished page there! By way of comparison, in order to get some sort of grasp on what the hell I'd accomplished at any given time I'd play pin-the-tail-on-the-donkey with this site. "It's as long as The Old Man And The Sea.. It's as long as Catcher In The Rye. It's as long as Joy Luck Club. It's as long as Girl with the Dragon Tattoo." It took me some hunting around to put it in perspective; finished, without editing, it's within 1500 words of this. Compare and contrast - once I had it to the point of editing, I had Scrivener reformat it for galley. It was only then that I discovered it would take about a ream and a quarter just to print the fucker out... presuming I made no mistakes.
The documentary is on Hulu.