I'm not sure why - especially - twinks are so concerned with overpopulated servers.
It's more than likely it'll be a pure shitfest at launch, sure. But unless you're super hardcore and wanna down Ragnaros week 2, I don't see much reason to worry: BGs won't be out until p3 and honor won't be out until p2. There really isn't much reason for a twink or semi-casual player to rush it anyway; if queue times are massive just give it a few days and it's gonna be ok. I mean if you took time off work etc. I can see why you wanna utilize the first few days, but in the grand scheme of things the first days won't matter unless you're truly committed to the game.
Personally I find the first weeks of a fresh server to be among the funniest (especially if honor and even BGs are out) but to each their own. Once you've gotten into the game it should be much smoother than every pserver fresh launch because of layering and dynamic respawns. So it really comes down to whether you're prepared to sit in server queue for 30 min the first few days.