I have to go with Orgrimmar, definitively impressed with the new landscape!
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Stormwind - The music, the pubs, the children running through streets, the waterways, etc... it's a very romantic.
Howling Fjord was my favorite zone. It had a great storyline, fun quests, and easily one of the prettiest zones in the game.
My favorite zone was Karazhan. It felt like a scary old ghost mansion. I loved raiding it late at night and getting all in the game feeling like I was going thru a haunted house. Plus, who doesn't love watching a good play?
I'd have to say Nagrand. It barely edges out Scholazar Basin and STV for being a jungle/Safari setting. Though I did enjoy Uldum A LOT in Cata.
my loved place in WoW is Nagrand. quests and the look is perfect. smooth to quest and to enjoy
My favorite zone must be Strangelthorn Vale. I remember first time i placed my feet in that jungle as a lvl 30'ish shaman, in vanilla wow and i was like "Damn this is a cool place" :D
Deepholm is my favorite, hands down.. flying past the constant expanding/contracting rocks while hunting Aeonaxx is just kick @$$..
Duskwood was my favorite all the way back to when I was running around after my trial account had expired. Freshly empowered by a full account, Darkshire and the Scythe of Elune questline waited for me to explore. Good times, I don't know how I'd take it if they ever lifted the trademark darkness from the zone. Just wouldn't be the same.
This is a really tough one. Nagrand is beautiful, Uldum is really interesting... but my absolute favorite has to be Winterspring. It was the first zone to really make me go "oh wow, this is beautiful." Plus, who doesn't like purple and blue kitties?
New Thousand Needles is awesome. The quests, terrain and being the captain of my own boat is great.
Un'goro crater, alot of memories there of ganking and being the victim of being ganked then coming back with revengeand of course farming all of that thorium