It's horrible game design having auras be as powerful and reliable they are, and having them be on a low active timer, and with a 5x as long CD. (10x if you didn't use 100% extend)
It's time this gets re-visted and re-worked because I can guarentee you, no one likes how auras work currently. 🙂
Edit: Implementing a vis wax cost or something of the sort to switch auras is acceptable.