I am not sure if boosting is a good idea as in the past when I played WoW I always enjoyed the leveling part of WoW. It would seem awkward to just come back to the game on be right at the level cap instantly. But then again I am not sure how the leveling process is now-days. I obviously will not have BOAs and I've leveled dozens of characters in the past on my old original account.
I am 100% sure I want to come back as a Orc Destruction Warlock for WoD.