I generally skip through details, and kill whatever the person with the exclamation mark tells me to, BUT
While I was leveling up my Lock I did the Taunka quest chain in Dragonblight. I started reading the quest descriptions, and by the end of the chain I was really into it. The line where the Taunka ask if they get to kill Scourge, and you reply that "Vengeance is a right given to all members of the Horde" gave me chills. I hadn't ever had the game pull me in like that before, and I thought the whole line was awesome.
Have you ever geeked out over a quest or something you did in WoW related to Lore?