Don’t know this game that well, so I would like to have list of the endgame quests that u should prioritize not missing, because of important loot, consums or other.
And just to get it started:
Crystals of Power (Ungoro crater Crystals Comsums)
Felwood corrupted Blossoms
Blasted lands consums quests.
Luck be with you (winterspring juju consums)
In dreams/Tirion Questline (plaguelands questline with pre-bis rewards)
The Linken quest line which ends with “dangerous to go alone”, awards a brilliant caster/healer pre-raid offhand, together with the boomerang trinket which is useful
for PvP.
Maybe you might be interesting in doing UBRS preq for key/ring, that allows you open the main door to this dung - Seal of Ascension quest. Many people still dont have that key and they still asking for someone with key to open the door, so they can go UBRS.
You maybe be interesting in getting keys for Stratholme (back gate entrance), Scholomance and BRD too - and also Onyxia/MC attunement qs are important aswell, like it was said above