At lower level there's very little content that even has effects that can be cured. By the time such effects start entering play most new healers have forgotten they even have the skill to remove them.

The worst one is Titan with the determination debuff that gets applied with the gaols. So many healers are oblivious to it and since it doesn't make the player's HP drop they don't think they need to do anything about it. I've even seen healers with the debuff wondering why they can't heal anyone.