some addons I use:
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auctionater (AH addon which lets you buy/sell easier aswell as better overview; must have)
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bagnon (one big bag instead of multiple ones)
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Selljunk (sells junk)
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BGdefender (instead of typing 'lumber mill 5 players incoming' you can just click a button)
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DBM (deadlybossmods -> also don't forget older versions like Cata, tells you what happens during the boss encounters; must have)
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PetBattleTeams (let's you save pet teams)
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PetJournal_QuickFilter (filter pets much faster)
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PetTracker (shows you where to find missing pets in the world)
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PlateBuffs (shows debuffs as icons over enemies heads)
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Postal (open mail automatically; must have)
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Quartz (better casting bar)
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SaySapped (if sapped your character says "Sapped by [insert_stealthy_rogue_name_here]")
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Skada (damage meters)
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WorldBossStatus (tells you which character already has killed one of the world bosses this reset)