Otherwise I'm just looking at the maps, and the region levels (i.e. Durotar, level 1-10) and thinking about the races and their routes to 60.
Some quick thoughts:
Orcs/Trolls and Tauren have it easiest. They never have to leave Kalimdor to get to 60. Durotar - The Barrens - Stonetalon Mts - 1000 Needles - Desolace - Dustwallow Marsh - Feralas & Tanaris - Azshara - Un'Goro & Felwood - Winterspring & Silithus. It's "Horde favored" according to Blizzard through Desolace and level 40.
"Alliance favored" on Kalimdor ends in Ashenvale at level 30. Now how Blizzard figures Ashenvale is "Alliance favored" given two Horde Flightpoints, go figure.
The Eastern Kingdoms is a little simpler. Each of the four races, Blood Elves, Undead, Human, and Short People, have their 1-20 zones for themselves. Here the "Horde favored" ends at 20, and the Alliance have two zones, Wetlands and Duskwood, that end at 30. Those really are Alliance favored given no Horde Flightpoints in either. But, countering that, Badlands and Swamp of Sorrows both have Horde Flightpoints and no Alliance Flightpoints. Clearly "Horde favored" and that's at levels 35-45. Blasted Lands. Nearly forgot about this place. Alliance Flight point, 45-55 level range. Pretty much "Alliance favored."