I agree, do hellfire / shatt quests, then head back to do instance quests in plaguelands / lbrs / brd and clean those places casually if you know the quests well. If nothing more than the get your spider and worg pets.

if you have the brew fest teleporter (or know someone that can drop one for you, half the brd quest are a snap)

I got a Circle of Flame for my new little warlock cleaning those quests, quite happy I did.