When WotLK first came out I looked at Quest spoiler addons. QuestHelper is the go-to for easier questing but that mod caused me enough problems I ended up just going lightweight with LightHeaded for spoilers and TomTom and Cartographer for navigation.
The recent Lunar Festival got me to try out another addon, TourGuide. It's a very simple, spartan addon that helps you quest. The guide consists of a bunch of chapters for specific chunks of content like Darkshore 12-17. Each chapter is a simple linear sequence of things to do: go here, get this quest, kill these mobs, turn in that quest, etc. Most of the value is in the guide itself, all the addon does is help you execute the guide in order. It's best when paired with TomTom and Cartographer, then it will automatically set up map pins and an arrow for you to follow to your next objective.
What does this have to do with the Lunar Festival? Some kind soul put all the Elders into a TourGuide. Just load up the addon and start following the instructions: first to Dalaran, then IronForge, then to get the invitation quest, then to your first Elder, etc. I spent a very restful few hours just following the arrow all over Azeroth to meet all 75 elders and get my title. (With a frenzied few minutes sneaking into Orgrimmar: stealth, dash, tracking humanoids, healing, reduced fall damage, swim speed. Ninja druid FTW).
TourGuide worked well for the Lunar Festival. But it's pretty limited. In particular you have to follow the objectives in order, there's no real support for skipping around the guide out of order. I think I might find that a bit too confining when levelling up. But one neat thing is it's easy to write your own tour: just the thing for quick guides to various things to do around Warcraft.
BTW, TourGuide is one of Tekkub's addons, a developer with taste much like mine. Very simple, clean addons that do one thing efficiently.