Using an awful button that did barely any damage and barely any healing (in place of anything actually usable within your standard rotation to kill the target faster) will not be justified by "I had some clutch moments with it!"

It was rubbish, hands down. Use a potion and cast something useful rather than bewail the loss of one of the least used/pressed buttons the class ever had. Side-note, still enjoying BLM - one of the few that most people seem (mostly) happy with after all the fancy class/stat changes. I don't recall bothering with Drain outside of pre-level 30 and I will never miss it.