That's pretty common in any form of media:
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.
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.