* I love it when a plan works out *Hannibal style* when running a (pug) dungeon runs with skilled people in the party doing exactly what they were intended to do. You feel you should run with this team forever.
* I love it when I save someone from death.
* I love it when a tank accidentally pulls 3 packs and I heal everyone through in panic *omgffs1esdqs/burstcooldowns/epichealz*, and even better when you get that rare "nice healing dude" pat-on-the-back.
* I love to admire the character in login screen after you picked up that new loot/completed your transmog set.
Can go for many more, guess there are some good reasons I've plyed WoW for all these years