@ Alisi
Ideally, you want to use WM as much as posibble. Its a nice 30% dmg boost and enables a few abilitys you cannot use without it. Stancedance, well. There are so few moments in this game, where u really need to turn it off. Only because there is an aoe incoming doesnt mean you need to turn it off. You can walk between the global cooldown and get into position etc. You should morely focus on how to maximize the time u can spent in WM. So basically, to answer your question, yes. You should be on WM as much as you can.