Was curious which quests people hold in high esteem/remember well.
My top quests would be:
)Top of my head:
Stalvan quest in pre cata wow
The entire Defias Questline in pre- cata wow
Onyxia attunement in classic
Invasion of Booty Bay post-cata (all of STV feels more streamlined in the overhaul imo)
questline that culminates in ‘Overlord’ in Hellfire (Outland)
entire questline in Wintergarde Keep, wrathgate and assault on Undercity (since removed)
Kara attunement in TBC
For me, the best quests were always the ‘Nesingwary safari’ quests. You first started with the weakest animals, you then progressed on to the harder ones, and at the end, you killed the king of the animals. I will never ever forget the feeling of completing it for the first time in STV, in 2007.
any poop quest.
The Ysera questline through Val’sharah in Legion. Gets me every time 
I have to ignore the irritating MY LOVE rubbish.
I do love the one where you become a quest giver and then have to go and rescue the people you sent out into Hillsbrad Foothills.
TYRANDE. I NEED YOU!
the cinematic was very good, No wonder so many people loved story from legion
The Cataclysm ones involving Garrosh.
Garrosh tossing Krom’gar off a bridge.
Garrosh calling Sylvanas a beach.
All that.
I still have a very soft spot for the OG Pamela Redpath questline.
No matter how many time I do it, Sunsong Ranch and the releted questlines are always will be number one in my heart
The whole Suramar-line is the 2nd best
Mugurlglrlgl! (and the rest of the chain in Azmerloth) pretty much had me smiling from start to finish 
I sometimes forget that not everyone at a game studio knows what each other part is developing for the game. So I assume there are some things in game you even as a studio member never have seen before, eh? 
The quest where the human male thought the blood elf guy looked like a lady.
Hilarious stuff
And most of the pandaria quests are fun
Love the Alliance vs Horde quest chain in the Jade Forest when you slowly uncover whats on the wall before the Jade Serpent statue gets destroyed and the Sha emerges.
A turtle made it to the waaater, a turtle made it to the waater, the cycle of life can be cruel, the cycle of life can be cruel🎶
I enjoy questing most of all and have plenty of favourites but the one that will always stick in my mind is doing the chain for my Felsteed back in Vanilla. Actually i loved doing all the Warlock class quests back.
A Tale of Valor.
That whole quest line. Nothing comes close to it. Starts as a joke but has a very good ending. To me it feels like it represents WoW or rather what WoW used to be.
Forgot about this
The quest in Un’Goro Crater that you help a (crazy) Knight.
I don’t remember the name of the quest though.