Let's try again

I made my 1st Ritualist when I bought 2 new slots in the store Friday nite and I have a question:
If you are a ranger you have a pet that follows or attacks for you...same with a Necro and his/her Minions.
My question is...since the Spirts a Ritualist conjures are stationary, what is the advantage of them since you are pretty much continually moving in a quest, mission, or exploring??? Do you just have to recast them? I would think that would not be energy efficient.
Any comments appreciated!
Thanks!