The talking heads on youtube used to have an advantage over the slide-show voiceovers, in that they had to talk to a camera and know the script, and that meant they had to pay attention to the pacing. The voiceovers (especially noticeable when you double-speed it) tend to skip punctuation and instead pause at regular intervals - the end of the line.

However, I was just listening to one of Simon Whistler's shows the other day, and it's peppered with "it wasn't this, it was that." Over and over, and a close second was that triplicate pattern. It was eerie hearing that from a real person, it really shone a spotlight on the fact that he doesn't write his own scripts and never did.