If you haven't read the short story "Unbroken" by Micky Neilsen on the official site, please do so. Not only does it give you a real sense of the development of the draenei during the Rise of the Horde period and after, it helps one understand the tone of this series of posts exploring the elemental spirits of the Warcraft universe.
We experience elementals on both Azeroth and Outland as we play World of Warcraft. While some pretty significant differences between those two worlds and their elementals exist (for instance, there are four named elemental lords involved in the events of Azerothian history who do not seem to have nearly the same influence on the development of Draenor before it became Outland), the spirits themselves seem to share similarities worth exploring.
Practiced on both Azeroth (by the tauren) and Draenor (by the orcs) the art of shamanism is more akin to symbiosis than that practiced by arcanists (who control or command mystical forces) or priests and paladins (who seem to either supplicate or demand the power of the Light). And while druids and shamans share certain similarities, a druid's power comes more from a relationship with the Emerald Dream that suffuses the living world and less with the component elements. Shamans concern themselves with the complex interplay between the elemental building blocks of existence. It is almost his role to act as a mediator, allowing them to work in harmony together.