Yea you heal in caster form as a druid, or tree, but only for 20 seconds out of every 2 minutes. Rdruid super fun in PVP, but here would be a really simple way to think about it:
Resto Shaman PVP: Use Wind Shear and Grounding Totem to interrupt your enemies while you keep earth shield and riptide up on a target (two Heal-over-Time spells, basically) and choose between healing wave and healing surge to deal with damage. Your special tricks are Nature's Swiftness, (actually called Ancestral Swiftness on Shaman but no one says that, ever....) combined with Greater Healing Wave for a really big emergency heal (probably the biggest on demand heal of any healer in PVP.) Healing Tide totem for some big aoe healing, and Tremor Totem to get yourself out of a fear without using your trinket. Also Ascendance which is another big aoe healing tool. Resto Shaman's provide very high, on demand HPS, (provided you can get a cast off,) and their ability to interupt enemies at range on a VERY short cooldown, (among other things,) makes them probably the most in demand pvp healing class most of the time. You have a CC called hex which has a medium cooldown and lasts 8 seconds. You have an "Aura Mastery' effect with the 4-piece pvp bonus. Shammies have to fake cast!
Resto Druid PVP: Spread HoTs on your teammates and use full HoTs+Regrowth Spam to create some pretty big HPS. One of your HoTs, (Rejuvenation,) allows you to cast a sizeable instant heal which is on a relatively short cooldown, (swiftmend.) Your special tricks include Tree Form, which makes regrowth an instant cast and allows you to spread Lifebloom on multiple targets, (Lifebloom is the bread and butter HoT,) and you have cyclone, which is a spammable CC that enemy players can only escape by trinketing. Resto Druids don't really have as much on-demand HPS as Shammies, but they can preform very well if you are able to establish HoTs right before the damage hits. You'd have the most spammable CC of any of the healing classes, and some pretty cool talent choices to beat. You'll be sort of squishy, but will have a multitude of relatively short cooldown defensive abilities to rotate in order to live. Resto Druids run away in travel form!
Disc Priest PVP: Stack Spirit Shell on people by spamming flash heals on them in anticipation of big damage, or in reaction to it. Spirit Shell is a 1 minute cooldown that last for 15 seconds, which causes the healing done to be converted to a shield. Otherwise, you spam Power Word: Shield on people, which is another absorb, (obviously,) and use Penance on a 10 second cooldown, along with a HoT called renew, (its weak,) and some other heals like Flash Heal, Greater Heal, Heal, etc. You have what is called an "Aura Mastery" which is an ability that makes you immune to silences, which you can use when you feel you might get interrupted on cast but you need to get heals off or your friends will die. You have a medium cooldown AOE fear that requires you to be pretty close to the target. You also have Life-Grip and Life-Swap to quickly reposition your teammates or Swap Health with them if they or you are about to die. Disc Priests are going to fear you!
Holy Pally PVP: Use abilities to generate Holy Power and other abilities to spend it. Use a bunch of instant cast ablities and casted heals that heal for a bunch. Put shields on people by healing them, (a percentage of the healing done just becomes a shield, its the mastery,) use Beacon of light to heal one target but have some healing be spread to nearby friendlies. Use Hammer of Justice on a 30-45 second cooldown, (I think?) depending on some talent that changes the cooldown. Its a 6 second stun. Your other CC is blinding light, which also has a cooldown. Cast Repentance for an 8 second CC as well. Choose between a few different healing cooldowns for different situations, including "Devotion Aura" which now actually acts as a trinket for silences. (Notice that Resto Druids are the only class without an Aura Mastery effect.) Use Divine Shield to avoid/break CC on yourself. Die really fast after you've used this ability and your trinket. Holy Pallies die after bubble!
Monk PVP: Roll around a bunch and generate chi with certain abilties and spend it with others. Use Revival as an emergency heal, diffuse magic is nice, paralyze is the CC, Nimble Brew is OP... Monks are new and I haven't rolled one yet!
Edited by Anoru on 5/24/2013 1:36 PM PDT