In WotLK, I can cook buff food that will give great stats for 1 hour (or less if you die).
Cooking is a very easy skill to level (The AH is your friend and having a fishing skill makes it even easier). I highly recommend leveling your cooking on at least one character.
Easy to level and it opens up both the Shatt and Dalaran cooking dailies, good cash and decent buffs. I recommend it.