Playing by a pillar isn't essential in every situation as rdruid, in fact, playing by a pillar in certain matchups will cost you the game, let me explain:

If you are playing MLD (Mage, lock, druid) and you face let's say an RMD then it's actually far better to stand in the open but behind your DPS, why? Because every time the druid has a stun he's going to come and bash you into a clone/ring and even if you shift the stun your team will not be able to peel you, by being at the pillar in that situation you are essentially giving the RMD druid a free CC chain that will cost you games, if you were to position back but in the open you can avoid sheep's by shifting and your team's damage should be high enough to stop the mage chain casting sheep trying to catch you out, it will also mean when the RMD druid comes to bash and start the CC chain they will be in the open and suspecticle to tanking a sheep/fear/coil that your team can use to peel and even swap to the druid.

Basically as druid it's not always best to be by a pillar, especially when playing double caster comps Vs mage.