I generally enjoy going through Grizzly Hills. Whether its the quests or the music its calming to go through. I always make sure to get a level in there when raising an alt.
My favorite zone hands down is the instance zone for the dungeon Old HIlsbrad Foothills. The lore around Thrall created some of my most favorite World of Warcraft books and games. The twist on the rescue of Thrall with the involvement of the nefarious Black Dragons was very entertaining and a good salute to the lore.
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My favorite zone is Nagrand. I love the floating islands and waterfalls, it makes me think of Japan. I also love the look of the sky when the sun is setting, it's just beautiful.
I'm going to go ahead and go with Elwynn Forest. This is due to the fact that when I first started the game, from the moment I logged in in 2004, I realized how beautifully made the game was just from the intro zone. All time favorite. Not to mention the music in Elwynn Forest goes very well with the zone as well.
I've always liked the original Eastern Plaguelands a lot. Not so much for appearances, but it was packed with interesting stuff. The Redpath family and the battle of Darrowshire was easily one of the best original quest stories (technically also WPL for Chromie's involvement). There was Tirion's hideout, Nathanos Blightcaller and his hounds, the excellent Benediction trial, the deceptively overpowered scarlet courier and all the other quest elites. it still had some 'collect X animal parts' quests, but there was also a lot of interaction between separate quests and areas that tied the whole place together.It was ugly and twisted and unforgiving, but the writing behind it all was fantastic for anyone that took the time to hang around and see what was happening there.
My favorite zone is Stormwind. More specifically, it's the lighthouse just outside of Stormwind harbor. Why? Because it's a beautiful spot my wife and I decided to picnic on with our characters before we got married =). While she's away at work I look often to that picture of our characters while in-game and get a smile of how much she enjoyed sitting there with our characters, my perky pug, her singing sunflower, and the V-day picnic kit =).It truly reminds me of how lucky I am to be married to such an awesome woman (in week we'll be married lol!).
The best zone is the new Silverpine Forest. The quest line here as a horde player makes really fun. The story behind it is great, to re conquer the hole zone, while fighting aside with Silvanas.
My favorite zone is Dragonblight. The Angrathar quest chain followed by the Battle for the Undercity made me level several characters to 72 just so I can do them again and again.
i have to say my favorite zone must be Uldum. I love the quests with that evil goblin and the nice cut scenes :D
My favorite zone is Winterspring. I remember running through the Timbermaw tunnel back in Vanilla and arrived at the light of the tunnel and just, the visual of the snow and how it gave me this tranquil feeling, it was pretty awesome.
Pre-shattering, I'd have to say Duskwood was my favorite. I had a ridiculous amount of level 20s for Duskwood is was pretty funny. The quests were unique, and I liked the history behind it... hence my username :) I love learning about the lore of warcraft (although it does kind of tick me off when they change it to make the game easier, but that's just me.) Karazhan was pretty cool too, I agree Ashelia. Loved the music!
My Favorite zone is most definitely Zangarmarsh, because I loved the quests, the environment, but most of all I loved sporregar and my tiny sporebat!