I quest mainly, just two characters, so collection quests aren't that bad, but I will probably skip those that I know have a really bad drop rate.

At your level I'd grind for a bit on the pirates at Tanaris (lost riggers cove), if you play at anti-social hours then hopefully it won't be too busy. Try Swamp of Sorrows (bit low for you now), Feralas or Hinterlands if you haven't been there already.