It seems like there's a few basic questing styles I have noticed in Northrend. There's the guys people who just sort of go where the wind takes them, maybe try a few quests out of this zone, a few out of this zone, and play around. Others are focused on the level 80 and rep grinds, so they have the quests they want to take mapped out and plotted, the best to get to that end game so they can start heroic dungeons, raiding, PvP, or whatever else it is they want to do after they're done leveling. Then there's the people who want to get into every nook and cranny of a zone, trying to finish every quest before they move on.
I'm generally in the last category myself. There's so much interesting lore and compelling story in Wrath that I don't want to miss risking a questline anywhere I go. Besides, if I finish all the quests, I'm that much closer to becoming a Loremaster, if nothing else. I do mix it up sometimes if I want to head into a zone early to grab a specific quest reward, such as heading into Borean Tundra to get my Axe of Frozen Death before heading back to Howling Fjord, but for the most part, when I head into a zone, I like to get it nice and cleared out from end to end.
How do you quest, and why? Do you fit one of the types above, or do you have another method?