Thats true. 
Nothing else will ever work.  Stay in the circle as much as you can. I only play healer and i always stay in circle (in a normal situation, not if it is hopeless 

). And surprise, i can hold out there without getting nuked within five seconds. Learn to use your PvP skills, use fluid aura to kick dragoons out of the circle, run into enemys groups and use Aetheric Burst , run into your own group and use focalization, use swiftcast + divine seal for media 2 every minute. Use sprint to run around in the circle and by doing that cast a divine regen on some peeps, use your level up points to unlock all three levels of Sacred Prism and cast it somewhere in the circle so your whole team and you can benefit from it (Hell it gives you 40% less melee damage for almost half a minute), use divine breath to instant res another healer and besides all of this you still have the oh shit buttons benediction, equanimity, attunement and purify.I dont know, i dont see any reason for any class to stay outside of the circle. As you see, whitemages do have a lot of stuff they can do to hold out and help the team. Especially Sacred Prism is your way to go as a healer who can stand in the circle.