I love the new Azeroth questing experience as a whole, but one that I really enjoyed was Uldum. All the references to Indiana Jones and other things really made the final push to 85 enjoyable.
The Exodar. One of the few zones in the game that offer a true feeling of peace and tranquility. It's like a safe haven in a world full of chaos.
This post was from a user who has deleted their account.
My favorite zone has to be Gilneas The whole place is beautiful reminding me of many places along the pacific coast. The quest line there is amazing and the whole time i can imagine worgen swarming over the countryside and towns.
From the Emerald Sanctuary, to the demonic hive of Jaedenar, over the Bloodvenom Falls, through the Irontree Woods with their poignant reminder of the legions power and beyond to the very walls of Timbermaw Hold itself. Felwood still ensnares me with every visit. It could be the focused, linear feel to the quests, with an ever more daring venture deeper into enemy territory. The sense of being on the razors edge, as the last line of defense against the corruption spreading towards tranquil Ashenvale and beyond. It may well be the sense of strength and resolve that the Druids of the Circle instill within you to face the Burning Legion head on. Throughout Felwood the satyr, the Nathrezim Lord Banehollow and his Shadow Council allies can be found in every shadow, every knook and cranny save the Irontree Woods. As you enter the glade of the ancients within the Irontree Woods, your eyes may travel ever skyward looking for the faces of these majestic beings. There is a palpable sense of sorrow and loss at the passing of such strength, wisdom, and knowledge. It is a reminder of what you stand to lose if you can not stop the corruption, even as it hardens your resolve to continue the struggle and stop the Burning Legion at all costs. The Cataclysm addition of the Nature and Nurture quest chain has become one of my favorites. At last you can in some small part repay the great sacrifice of the lost ancients, in addition to seeing the fruits of your labor in Felwood. Beating back the corruption throughout the zone and most notably in Whisperwind Grove. This is just a little of what I see and experience in Felwood. It stands out to me and I never miss the chance at leveling in what I consider to be a story rich and arresting area within the mythos of Azeroth and its war against the Burning Legion.
I liked Storm Peaks, for one because it had Ulduar (favorite raid) and two because of the daily pvp. Both ended up fizzling out though :(
Netherstorm, pretty nice area
Most definitely Vashj'ir.Such a wonderfully pleasing palette of colors and an epic feeling, knowing you're among these (most likely) centuries old sea creatures and rich Night Elf architecture.
I would have to say Zangarmarsh just for the reasoning that it contained Serpentshrine Cavern. The Lady Vashj fight was epic and i think that is one boss that I will never forget along with the Tainted Core macro.
Stormpeaks is by far one of my favorite zones, the landscape is beautiful and (it pains me to use the word) enchanting. The music is eerie and beautiful as the cold winds of Northrend blow through the mountaisn and ravines. it's definitely the place to escape to.
While it may be usurped by Deepholm or Vashj'ir with the passing of time, previously my favorite zone by far was always Sholazar Basin. Sholazar Basin was the first zone I went into feeling like I had just embarked on an actual adventure and not just a quest fest. Flying in on a helicopter into this exotic and completely out of place location among all the Wrath zones, it just felt awesome and more than anything else, it reminded me of my previous favorite, Un'goro Crater. Something about tropical dinosaur lands man. Of course, when I went through the entire storyline in one night and heard about going back to a "similar location elsewhere in Azeroth" I immediately knew what it referenced, and I thought it was so awesome. Going back to my old favorite zone to help me complete my new favorite zone.