It will depend on the fight, for what you want to do.
Sometimes you are better off, moving out of puddles of acid.
Other times, you heal through them and maintain steady DPS.
If you can drop a Fire, Frost or Nature Resist totem, that can help a lot.
Also you can choose a resistance aura for the pally, although it won't stack with totems.
If you take a look at Youtube videos, in a lot of fights you can position your guys and then not move them.
I generally use follow and a movement key to break follow.
Then have some mapped keys, for "movement - Window: All without current", ie independent slave movement, if I need to move them and not the tank.
In another thread, Khatovar suggested two follow macros for melee a) follow tank; and b) follow healer.
Which you can then push to have melee run out of AoE nastiness or back to where the melee is.
I do have a spread out macro.
In my case Shift + Tilde ( ~ ) is the hotkey.
It moves my toons diagonally away from the leader.
Basically Q + Up, Q + Down, E + Up, and E + Down.
For heals, IS Boxer with repeater regions is the best.
Click on the frame, for who needs the heal.
But if you are going with macros, you have two options really.
Toon specific heals, as in this macro heals this toon (one per toon who might need heals).
Or assist heals, where you assist the hot/active toon and heal their target.
You can go with:
<Insert /assist method>
/cast [help] Renew; [help, target=TargetTarget] Renew... type logic in heals
Your paladin will have Decurses for Magic, Poison and Disease.
Your Shammy can drop a Cleansing Totem for Poison and Disease.
Your Mage can decurse for Curses.
Your Priest can do Disease and Magic.
I'd probably do the totem for Poison/Disease, Mages for Curses and then either Cleanse or the Priest for Magic... Priest can also "mass dispel", if you need to hit several toons at once.
It will depend on the situation, on whether it is worth curing something or not.
In the Pally's case, its often better to not cure stuff, if they'll survive, since that is extra mana from spiritual attunement, when the damage is healed.
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