Every healer should play a level 15-20 glad tank

[Kraggy]

but I had no clue how much until I experienced the frustration of tanking with a conj who Medica spammed.

Kind of ironic in view of the complaints I've seen moaning about CNJ NOT using Medica.

Face it, the healing skills in this game simply INVITE over-healing .. it's crass having no instant heals and heals with 2s cast times, when in that time a tank can be two-shotted in the healer isn't chain-casting. The early dungeons are brutal for new healers, either they spam and get yelled at (as you're doing here) or else they wait till the tank has taken damage before starting to case and get yelled at when the tank dies .. of course, since many tanks doing the pre-level 20 instances are horribly undergeared there's often no chance for the healer to get off a second Cure before the tank goes down.