I've had a bit of luck finding youtubers/twitch streamers who are content to let some dead air go by if they don't have anything important to say, and definitely don't do any yelling or screaming. It's a real nice change.

Partially I'm just making this post to share the few I've been watching the most:

Jagged Appliance, a Supreme Commander player and caster.

Growling Sidewinder, a DCS pilot who goes into detail about dogfighting and BVR fighter jet tactics.

Tasteless, a Starcraft caster who plays Brood War and chess in the Korean timezone.