Sholazar Basin is my favorite because of the tropical feeling. Makes me feel like I'm on vacation even if I flew around for hours herbing.
Silverpine Forest and Stranglethorn was great when leveling. Currently, Deepholm is the best of the new zones.
My favorite zone would have to be Zangarmarsh. All the giant mushrooms and crazy looking creatures such as the sporebats, spore walkers, and sporelings gave in a really unique feel. Everytime I level an alt I always make it a point to quest there as much as possible.
Mine's gotta be Sholazar Basin, it was a nice break from the gloom and doom of Northrend and lightened the mood by having you make booze, be a slave, and kill kill kill animals.
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While I love Nagrand, my vote goes to Grizzly Hills. Sure, the questing wasn't the best, but the scenery was beautiful, and the music is positively orgasmic. There have been nights where I'll just hang out in Grizzly Hills, listening to the gorgeous music and just chatting with guildies. All my alts quest through Grizzly Hills, just so I have a legitimate excuse to be out there.
My favorite zone was Vanilla Ashenvale. Playing a human way back in the Beta days of Vanilla it was an amazing feat to travel to Ashenvale at level appropriate for the zone. I remember leaving Stormwind with my Human Rogue and 3 friends and we spent the evening traveling to Ashenvale. It was this really epic journey and until then I had not experienced any of the Night Elf areas. Running on foot the whole time picking up flight points along the way. It really was an amazing thing to see the first time I ran into the zone. The look, the foreign forest look and feel. It was amazing.Other zones that come close to being my favorite include Vanilla Westfall, Vanilla Redridge, Vanilla Loch Modan, Beta Ironforge, Vanilla STV, Zangarmarsh, The forest part of Terrokar Forest and Vash'ir.
Duskwood, where my friend (who started me on WoW) spent a ton of time with me leveling.(EDIT: weird, this post didn't get me another "ding" on the Cross Your Fingers site achievement.)
Now and then I tour around guildies with my Chopper, and my all time favorite zone is: Deadwind Pass! I guess I'm the only one in this thread but I just love the ... silence and greyish color ^^.PS And of course, long live Karazhan!
Western Plaguelands is my favorite zone. Mostly because it brings back the memories of sneaking past the Guardian of Blizzard that use to prevent players from entering during the original Alpha/Beta. It use to be littered with ziggurats, much like the Plaguewood in Eastern Plaguelands.
EASY - Nagrand. The whole zone amazes me. I love the crumbling land. The floating islands with trees and waterfalls coming off them. The history of the whole land, the quests (ring of blood and gronns), the whole twilight area, EVERYTHING. I spent so much of my Burning Crusade time in Nagrand and even another good chunk of it just doing the little things there. Absolute favorite zone.
My Favorite zone has to be the new version of Redridge Mountains. It's good to see an old zone given so much life. You really feel like part of the story right up until the very end. I had to fight back tears during the last quest. Not to mention the darker humor from Keeshan and his crew. Every character of mine that has done the full zone still has Keeshan's bandanna. All in all, it's a very in depth quest line and zone.
I'd have to say that my favorite zone is Twilight Highlands because of the lore behind the quests.
My favourite zone in all of WoW would have to be Nagrand. Not only was it a great place to pvp, but it was also one of the most beautiful and well put together zones Blizzard has made yet.
My favorite zone is the new Hyjal. The zone seems peaceful and the quest line is awesome.
I like the new Darkshore area. That big tornado gives it an awesome look.