We all know about the zeppelins and the boats, the workhorse transportation system of Azeroth, but due to the eccentricity of the many transport options in the game, the shortest distance between two points is not necessarily a straight line. For example, an inventive Horde player without a Hearthstone up who wants to travel from Silithus to Orgrimmar can settle in for a long flight -- or she can simply chug a Potion of Deepholm and take the Orgrimmar portal from the Temple of Earth. No potion, but you've quested through Sholazar Basin? Take the Titan Waygate from northern Un'Goro Crater to Sholazar, then fly south to the Horde's zeppelin at Warsong Hold. You'll still beat a wyvern flying from Cenarion Hold.
With even a few of the following options, a max-level player with some imagination should be able to scrape together a few methods of considerably shortening a journey.