My favorite zone the first time i went through it was Howling Fjord. Something about the elevation changes and layout of the zone (especially from the alliance side) just struck me as something completely different in WoW.
Silithis. spent the most time there in classic, and always loved the pvp and different quests and activities there.
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Of all possible zones, Elwynn Forest is the one that convinced me to actually spend money on WoW.
My favorite zone is Howling Fjord. I love the alpine feel of it with the trees and mountains to the north. I also love the viking feel of the Vrykul architecture. I really loved the Tuskarr daily where you had to find love for the Reef Bulls/Cows. So cute!
My favorite zone is Vashj'ir. It may have some issues, but the idea and execution behind it is wonderful. I think they did a beautiful job of making some beautiful and breathtaking vistas for the zone, and making it underwater with a real 360-degree feel comes out to make the zone just a great new experience as well as a visually pleasing place to quest.
I have to say I love Twilight Highlands the most theres so many dragons flying around. Theres also so many different parts to the zone with grass covered fields to fiery rivers flowing through mountains.
ungoro crater was my fav because with the devilsaurs i got to feel like i was in Jurassic Park
Vashj'irIt's new and fun. With a great story.
Winterspring because I love furbolgs :D
Nagrand. Most of the BC zones are, frankly, eyesores. After all the ugly purple and orange, traveling through some natural-looking scenery is great!
My favorite zone would have to be Hellfire Peninsula. I loved questing there and then randomly getting crushed by the Fel Reaver at level 60. It was always hilarious trying to outrun him and still getting stomped on.
My favorite zone is The Lost Isles. The quests are epic and hilarious, and they represent the goblin race perfectly
Grizzly Hills by a long shot. The music and the environment is just absolutely breath taking. My parents used to take me camping as a little kid, and the Hills reminds me of all the places we used to go when I was younger. It gives me an interesting place to be able to just sit and watch the wild life while listening to the amazing fiddle music.
Sholazar Basin was my favorite, mostly because of the wide array of beasts that, as a skinner, I could pick off easily & farm loads of Borean Leather in fairly little time. Also, any zone in which Hemet Nesingwary is present is ends up being a fun one!
My favorite zone has got to be Deepholm, I like the size of the zone it's easy to get around and there's so much to do with many rare monsters to possibly find while your leveling. The feel of it is pretty nice to and it doesn't seem to be to crowded on my server so leveling was a breeze there! Herbs and fish was also a plus =)