A lot of healers also don't realize that you can cleanse said incinerate DoT. Even if the tank misses the interrupt, you're going to do a *lot* better just cleansing the DoT rather than trying to heal through it, considering how hard it hits.
Yeppers. I remember one time healing HM LI and I cleansed missed incinerate off the tank. After the fight, he said, "No healer has ever done that for me before"