I managed to finish getting my alliance hunter to max level yesterday. His total played time was 18 hours, which was about 2 1/2 hours faster than my warlock. Because the alliance zones were all new to me, I was still basically reading all the quest text, so I was surprised it was that much faster.
I played Beast Mastery the entire way. Interestingly enough, even though it appears to be one of the strongest specs at end game right now, it didn't feel as strong to me while leveling as Marksmanship does.
The other thing that I realized as I've been working Joar through the various end game content is that I'm really going to want to see the War Campaign alliance side as well, which means I'll be doing the WQ rep grind on this alliance toon as well. Not really what I planned, but I suppose that's fine. I'm guessing I'll be mostly through it before I get to that point with the fifth Horde toon anyway.
My Horde hunter is sitting at level 118 and working his way through Nazmir. That's an interesting zone for me this expansion because it combines some of my favorite questlines with some of my least favorite of the expansion.
One thing that has also become clear is that once the eventual leveling nerfs hit later on, it will very likely be possible to go completely from 110-120 entirely in a single zone. For me, that will be AWESOME! because it means I'll be able to rotate the crew among 6 different leveling plans.
Also tried the Warfront on Joar. It's a fun and interesting thing. I'm looking forward trying it on the alliance side as soon as the Horde loses it again. It's at least a good way to get a few decent gear upgrades for new 120's which will be a nice way to get them started and make world quests a little bit easier.
So the plan till this time next week is keep working through emissaries and stuff on the two max level toons, give the first wing of LFR a try and continue to leverage Warfronts as they're live for gear upgrades on new max level toons. We'll try to get the Horde hunter to 120 and get him in the WQ groove and then start on leveling the death knight.
Still not sure if the plan is going to be Frost or Blood for the DK, but we'll have to see what Frost's survivability feels like.