As noted above, the collections suck but are required to open up the rest of the chains. The upside is that if you do all of the quests, you'll hit 80 on your 5-man group in Zuldrak or Sholazar, which means you'll have all of storm peaks and icecrown for making cash, so getting 5 epic flyers is stupid easy.

If you just wanna get there fast, grinding in instances is the fastest, though you'll have shite for faction for any of the dailies and probably have to go back and do the quests anyway to open them up.