i don't think the question applys to heroics, because it shouldn't. I mean i could say i am the biggest help to healers in a heroic because i can get 3 Divine storms for 30k each in about 5 seconds(if i am really lucky.) does that technically count as helping my healers? Also all because you pop something doesn't mean your helping your healers.
If your using an ability to keep yourself alive because you wanna keep dpsing, but your healer had you covered your not helping the healer your helping yourself. Now if you pop something and pull an add because the tank is taking a lot of damage(no matter what class) that is helping the whole group. It's far to situational to say well i use this so yeah i guess i help.