Winterspring and Tanaris are some of my favorites. Hinterlands is another, love the awesome troll ruins there and mithril $_$.
Hillsbread ofc due to Tarren Mill/South shore war.
Looking forward to living through them again!
Tanaris and Redridge
For me it's definitely Un'Goro.
There are few things quite as satisfying as running around a zone and completing 14 quests at once for that huge turnin.
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Stranglethorn vale is best location. lots of zergs!
All green sunny zones makes me feel happy.
#1 Mulgore no doubt then there are some others such as
Arathi Highlands
Hinterlands
Loch Modan
Elwynn Forest
Stranglethorn Vale
Then I also enjoy green zones that are not as sunny (but not nearly as much as sunny ones)
Hillsbrad Foothills
Un'Goro Crater
Ashenvale
Feralas
Rest are depressing as fudge, maybe it's because I'm a COW
/MOOOOOOO
Duskwood is the best. The atmosphere, the theme, and the quests are all quite good (with the exception of the travel from east/west repeatedly). It's a tremendous zone and I always do it.
After that there's a lot of pretty good zones, like Darkshore, Tanaris, Un'Goro, Hillsbrad/Alterac, and Feralas.
Probably Ashenvale - the first serious clash with the opposing faction giving you a kick of adrenaline, great lore in terms of Warsong Gulch and of course, the soundtrack, to my mind the best in the game.
I like 1k Needles. The feeling of being away from all civilization and just out in the burning sun in the wilds is cool.
Also, this. Moving to Thousand Needles always gave a feeling of actually "growing up", leaving the Barrens where you did spend most of your childhood and now moving to uncharted areas where you are on your own.
As horde I also love all the early Forsaken areas, don't know why, probably something about the tragedy of it all.
I don't know guys how about you, but i find Darkshore (Classic and TBC) the most atmospheric and sorta "magic" location among the rest. Including everything: quests, music, ambient, creatures and cities. Maybe cuz it's the first dangerous location i'd made to back in the times. Maybe cuz myself is a kind of person who like to have some time being alone with myself and my thoughts, but this is my totem location. Do you hear those curious ambient sounds watching the image? Cuz i do.
P.S. Still i love every single location, but this one has its own zest.
I've always had a soft spot for the starting zones. My overall favorite zones are Mulgore and Elwynn Forest by far! :)
I like Felwood and Winterspring, its two great zones and the road to 60 is almost over. I played Alliance in vanilla so Elwyn Forrest, Westfall, Redridge Mountains and Duskwood has a special feel for me. This time im going to play Horde and pay some new (hopefully) awesome zones.
Tirisfal Glades and Silverpine Forest, I enjoy the atmosphere of the Undead leveling zones a lot. Looking forward to giving Hillsbrad Foothills another try as well but it did not make as much of an impression on me as the zones that came before it.
It's gotta be Feralas. Exploring as a lvl 46 hunter and suddenly stumbling upon an elite dragon named Emeriss. Filled me with awe. Been fond of the place ever since
Ashenvale floats my warcraft boat. It just has a great feel to it!
Tirisfal Glades. I like the fast and easy leveling of the 1-10 zones, and the fact that the questing experience is self-contained. It doesn't have quests that send you to 3 other zones to start 3 new quest chains when you're not even done with the zone you're in. It doesn't have you bouncing between two quests hubs like Durotar and Elwyn Forest do, and it has better access to the faction capital than Mulgore and Teldrassil do. Many of the quests feel related to each other, like different steps in a cohesive campaign. And it has that dude on zombie island.
For me:
Overall - Swamp of Sorrows
Horde - Silverpine Forest
Alliance - Dun Morogh
Teldrassil is probably my favorite place to quest, it feels like home.
Westfall has big place in my heart too.
Redridge! I love the autumn theme of the zone, and the fact that it has a lot of different mobs and also contains my favorite hub, Lakeshire.
Hinterlands. I love its tranquility and the open-world "mini-dungeon" Jintha'alor stands out from other leveling zones.