You mean busting with gf/gh? Sorry but that is meaningless. This is an emergency measure, which holy has to use to cover its otherwise low HPS. Gheal serenity spam with renew is about 10% less than a pws/penance-ghealx4 combo, when you ignore all overheal. When you factor in the higher overheal that holy mastery, renew all large crits have you are 20% less. Disc can produce the same HPS as serenity/fh/gh spam without using flash heal by popping AA or spirit shell or it can produce higher HPS using AA/SpS with flash spam.
Holy has a good emergency rotation, but that is really rubbish, when you consider that other classes and disc, have short powerfull CDs they can pop instead.