WoW mount
The World feels much larger - There are no flying mounts at all, flight paths are few and far between, and the first ground WoW mount is available at level 40. This forces you to run almost everywhere on your feet with a base movement speed. Druids, Shamans, and Hunters have it a bit better because they are able to boost their movement speed via various abilities (Travel form, Ghost Wolf, and Aspect of the Cheetah).