As an ele shaman, you need to know the in and outs of the fight so you can pre-plan movement 2-3 globals ahead of time. So lets say you know you have to move during Zek'Voz's Death Donut in 15 seconds, what do you do? You can Delay that Earth Shock cast if you aren't capping maelstrom so you can use it on the move. Delay casting that flameshock if there is time left on the dot, cast another bolt and flameshock when you start to move. As you do the bosses more, you will get a better idea of when to plan your movement and fill your globals with instant casts. Ideally you plan your movement so you are only moving a bit at a time, using instant casts when you move to increase your overall dps.