While I mostly play orc in Canta, I am sure that the healers in 15 have heard this phrase "Dispel only." When I have heard it I have wondered if that player really knows what they are asking of the healer, oftentimes the only healer in a raid for the 15 and 30 zones. So I would like to provide some facts about various skills.
Fighter/Warrior skill Charge has a range of 20m
Archer/Hunter skill Long Range adds 3m to any attack
Most of their attack skills have a range of 24m
(These 2 skills alone mean they can disrupt, possibly kill, the healer from a range of 30m.)
Mage/Pagan skill Meteor has a range of 42m
A few of their skills are set for 30m
But most are at 27m
(And why most that play this class insist on being the front line, I will never understand.)
Ranger/Assassin skill Mental Storm has a range of 13m
Priest/Oracle skill Hasty Heal has a range of 30m
Most healing skills have a range of 27m
However, Dispel has a range of 21m
At a healer's max healing skill range, the range classes have skills that can disrupt the cast. When you ask for dispel only, healers become the main target very quickly. Virtually sacrificing the healer, yourself, and the possibly the entire raid during a push.. I realize that it is hard on the melee class to break away from a battle to get within range for dispel but they can help themselves by being aware of the debuffs on them.
These 2 debuffs level 1 Dispel cannot clear, potion has to be used to get rid of them. Please notice what each does as one decreases the defenses and the other decreases the HP. Help yourself and your healer by using potions, please.
Most healers will try to dispel when it is possible.
Be thankful that there is a healer in the raid to begin with, being a PVP healer is not the simplest class to play.