Here are the WoW UI addons I use. * indicates I consider it essential.
- FlightPath*. Lists the locations you can fly to on the map. This should have just been part of the original game
- Auctioneer*. Lists the price that things sell at and polls the auction house.
- Titan Bar*. A bar at the top of the screen that shows all kinds of stats.
- Gatherer*. Remembers where herbs/deposits are and allows you to search its database
- Cosmos. I still love good old Cosmos for a whole variety of additions. I really like how it gives you combat information, knowing when a monster has gone berzerk is extremely useful. It also includes SkyParty which I would love our whole guild to get. It shares Quest information using special chat channels and therefore you can know when everyone in your quest has finished a party.