But if you're just a talking head, I'm not interested. I'd rather read a blog post. I read faster than people talk, and I honestly don't have the patience to sit there and listen when I can read the same words in a written essay in half the time.
Yes, it carries a hint of panicked "don't go away, I'm not pausing to breathe, don't switch over, there's no pause, I'm a continual flow of fast information, come back, come back".
It's different from the "what's up guys, blank here!" friends-with-audience attitude.
http://tvtropes.org/pmwiki/pmwiki.php/Main/LullDestruction
The unspoken 'rule' being that a lot of creators seem to think any silence for more than five seconds is considered 'boring', so you end up with speaking that sounds more like the speaker is a six year kid with AHDD after a sugar rush and too much caffeine.
If you think it's bad in Youtube videos... well, it's even worse in a lot of modern day cartoons.
The edit out all of the silence between sentences, as if they've never heard of full stops or paragraphs.
Perhaps their audience will get bored if they aren't continually being bombarded by inanity.