favorite now is still STV, Great leveling zone for the horde
Nagrand's a personal favorite of mine, it's gorgeous, the sky is brilliant, large waterfalls if you know where to look, big open plains, excellent skinning from the clefthoof and the snakes on that cliff, you know the one. The quests felt epic even though I had to save that one dumb corki so many times, lots of hunting to do from nessingwary, and you could farm just about anything you needed. Back at 70 if I wasn't doing my netherwing/skyguard dailies you could probably find me in the hills and valleys of Nagrand.
By far the best zone in the game is Nagrand. Between all of the green scenery, the mountains, and the hunting chain quests from Hemet Nesingwary it has a great outdoorsy feel. Also a great place for farming ore too!
Uldum, great Quests, looks awesome.
My favorite zone would have to be ungoro crater. I Like this zone because it reminds me of my favorite movies, the Jurassic park series. Whenever im here I feel like im in one of the movies.
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As much as it was occasionally a pain, I love Zul'Drak. The whole concept of the trolls sacrificing their own loa to fight the Scourge was a brilliant piece of storytelling for me. It has so many facets to it. It shows the pride of the trolls, how they won't submit to the Lich King. How in their pride they crossed the line to try and save their lives by sacrificing their souls. It was the first time, more than in Stranglethorn, that I truly got a feel for the troll's mentality and how they operate.
My favorite zone since vanilla has always been Duskwood. I just love the look and feel of the zone. It really fit the whole scourge invasion thing better then any other zone in the game.
Eastern Plaguelands is cool. The questline with the caravan is one of my favourites. Pally pals! (It helped that I was playing a paladin at the same time haha)
Karazhan is just the most beautiful and atmospheric.
Zul'Aman if raidzones count, theres something about the zone... its like a giant outdoor temple devoted to the Loa.
Zul'gurub has to be my favorite, even though it's an instance and not an "outdoor" zone. Every time I go in there I can't help but to be amazed at all the details, they give me the feeling that the developers put a huge amount of effort on it. I liked it pre-Shattering and now I just LOVE it, with all the added plant life and bugs and trolls working around the place. It really makes it look so full of life.
Grizzly hills is my fav as it reminds me of my home, Colorado
My favorite has always been Zangarmarsh... I love the mushrooms and boglings. Its a great environment and I hope that in the future it is expanded and enhanced.
My favorite zone would be Nagrand. It's the one i remember having the most fun in when i was playing with my ex-gf.It's the colors of the zone, the Nesingwary quests, the massive son of gruul running around, the ring of blood and even the Corky quest ( you little punk always getting caught ! )
My favorite zone in wow was in wetlands where Grim Batol is pre Cataclysm. Looking over the cliff at the waterfall was an amazing view and I truly miss that place :(. If i'd have to pick another spot it would have to be Netherstorm, I don't know why I liked that zone so much on my mage but when I leveled my other classes through there it was not fun but on my Mage I truly enjoyed it.