Hey, i would start by saying that you're very wrong.
All healing classes are not hard to play as a player who through MoP have lvled up 4 of the 5 healing classes to lvl 90 and played them in atlast normal raiding.
The first thing i would say if you're deciding to reroll healer is that as a difference from DPS, theres no actuall list of rotation as being a healer requires you to judge from the situation you're in what you should do next. Ofc in normal settings you want to heal ppl in this order Tank > Healer > Dps, but ofc in a burn fase at the end of a fight could require you to priorise dps over tanks cuz of the difference in dmg done.
All that being said i'll explain a little of the 4 healing classes i've experienced so far...
Paladins are a little OP in PvE healing atm in my opionion and the core spell you'll use through a raid fight would be Holy Shock as offen as possible as this will be you main holy power builder and Word of Glory as your single target Holy power dumper. Allways have beacon of light on the tank taking most dmg or if wanted by the raidleader someone else. Use holy light as a single target spell between holy shock CD's and primarly only use Diving Light on the tank with beacon of light as it grants you a change of Holy Power. Never use holy light on the beacon when theres other ppl needing heal as the beacon will receve 100% of the healing done by holy light. For AoE you would still want to use Holy Shock as you main Holy power builder and use Holy Radiance in between ( BUT watch out for you mana as its farly expensive) and Light of Dawn as a holy power dumper.
Druid is a healing class with mostly HoT ( Healing over time) and its primary spells are Lifebloom on one of the tanks, for periods of raid dmg you want to keep Wild Growth on CD as well as using rejuvinasion on the targets you see need the extra healing. You will also want to use Swiftmend on CD as it will grant your mastery to proc, increasing you healing based on your mastery ( Any healing thats not a HoT will proc this btw, but Swiftmend is the most efficent) and using swiftmend will also create a circle around the target healing up to 3 targets within over time. I also know some healing tend to use Wild Mushrooms in their healing rotation, i dont have any insight on this and have been doing good without. You also want to Nurish the tank with lifebloom to keep it refreshed or Healing Touch if the tank is taking high dmg.
Monks are the new class introduced in MoP and can also heal in form of Mistweaver. A monk healer in many ways like a druid with HoTs and a few direct heals. As a MW monk you will want to have your healing statue up 100% of the time, using renewing mist on CD as it will jump to 2 additional target healing them all over time. Use Enveloping mist along with Smoothering mist on targets taking high dmg, use life cacoon as a single target save as it will grant a good shield along with increased healing to that target. Revival is a monks version of Tranquility or Divine Hymn and should be used as a strong healing Cd as it heals the entire raid for a good chunk of healing. Use mana tea ( U get mana tea charges from using you chi spells) frequently for mana regen as it gives u 4% mana per charge.
As of Priest i am only familiar with holy. Holy priests are centered mostly around aoe healing but can do desent singletarget as well. Depends on whats needed you might switch chakra several times over an encounter. Sanctuary for Aoe and Serenity for single target. Sanctuary makes Holy Word: Chastise to a Aoe spell that u can place on the ground, use it wisely, Serenity makes your Holy Word; Chastise into a single target heal which also renews the time on your renew if theres any present on the target. You want to switch between heal and greater heal depending the the dmg income for single target and use circle healing on CD and Prayer of healing in between for AoE healing. Allways use Prayer of mending if all charges is used and keep a lightwell / lightspring on the ground as much as possible and if its a lightwell make sure ppl actually use it. As a holy priest your blessed with a strong Aoe smartheal CD called Divine hymn, with heals the 3 targets in the raid with lowest health for a pretty good ammount, this is channeled over time.
As of Shamans i havent lvled one up yet so i cant really give you anything on this class yet.
This might have been a long answer to a relativly short and easy question but i hope this will help you decide that to reroll as. =)
Edited by Horcored, 13 February 2013 - 07:58 PM.