I'm taking a group of 5x Holy (Shock'adin) Pallies to 85th, before MoP.
They're 62nd now, and following the Zygor leveling guide.

Unfortunately, that does give some collections.
The really painful ones are skipped, which can mess the guide up a bit in that it expects you to be whatever level but you're under that.
At least it doesn't say to take the next quest in whatever chain, if the earlier stuff was skipped.
Most of the collections haven't been too bad, on an empty Hellfire.

The Horde quests are similar, but a bit different from the Alliance quests.
This is my first team to have quested in BC, as Horde.
So the quest process is still new and somewhat interesting.