If it happened the other way, Horde would be bitching that Alliance gets all the lore, and Alliance gets all the facetime, and why does the final raid have to take place in STORMWIND? Etc, etc. We obviously see this from two separate perspectives, so I am just going to walk away from our chances at further communication on this specific topic.
As for this topic, the more time we spend in Horde country, with Horde bosses, and Horde cutscenes, the more I KNOW this game is all about the Horde. Varian had a short cinematic for his death, while Vol'Jin not only had the similar death, but the entirety of the Sylvanas storyline playing out as well. Everytime there is a cinematic, save for the very first game, Horde seems to get the limelight. Even the original game was Orcs vs Humans. Orcs got first billing in the title. Damn near every Dev is Horde, save for a small handful.
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Mt Hyjal has just as many Tauren and Nelfs. Also, Thrall, Aggra, and a handful of blood elves and more can all be found there.
Vash'jir is certainly a neutral zone given that Naga are on neither side of the fight, unless you count the Illidari, who have both sorts of elves.
Twilight highlands was predominantly Dwarves, and yes, the other zones were neutral.
But, while Horde was getting all kinds of new stuff in Silver Pine, Hillsbrad, Arathi, WPL, and a handful of other formerly Alliance dominant zones, the Alliance lost South Shore, Theramore, part of Stormwind, the human starting zone, and more.