As a healer that struggles to enjoy high-level mythic keystone dungeons, I've come up with some pointers that if combined, will make more challenging content go much smoother. I will avoid the "know the fights", "don't stand in fire", and "don't pull adds", as those are a given.

TL;DR: Treat the dungeon like Vanilla WoW, where tank threat-gen, dispels, stuns, silences and CC are top priority.

General

Leader

• Mark targets for CC, focus DPS, etc.
• Talk about pulls before they start, where necessary
• Coordinate when Heroism/Time Warp/Drums of War and battle-rez are to be used
• Let dead people know if they should release & run back, or wait for a rez

Healer

• Anticipate damage
• Prioritize dispellable debuffs
• Call out if you need mana
• Use proactive crowd control on every pull. Continually CC throughout the fight.
• Use stuns and interrupts on cooldown (ranged silencers should do their best to help wrangle-in loose casters)

DPS

• Use proactive crowd control on every pull. Continually CC throughout the fight.
• Use stuns and interrupts on cooldown (ranged silencers should do their best to help wrangle-in loose casters)
• Use survivability cooldowns and self-heals if you drop below 50%
• Smart DPS > More DPS

Tank

• Don't over-pull. Slow is smooth, smooth is fast.
• Don't break CC
• Position the group so that adds don't get accidentally pulled
• Use proactive crowd control on every pull. Continually CC throughout the fight.
• Use stuns and interrupts on cooldown
• Don't assume that everyone knows how to skip the trash
• Keep an eye on healer mana

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Affixes Needing Strategy

Skittish

The tank produces 80% (75% in 7.2) less threat. During combat, a fixed amount of threat is also periodically awarded to a random player.

Healer

• Save your cooldowns for DPS that pulls aggro

DPS

• Install Omen Threat Meter and turn on the audio notification.
• On AoE fights, wait 5 seconds before starting (3 seconds for ranged DPS)
• On AoE fights, switch targets when getting too high on threat
• If you pull aggro, immediately use threat-reduction cooldowns (if you have no threat reduction, then use survival cooldowns and STOP DPSing)
• If a hunter or rogue is present, threat redirection techniques can be used to start DPSing without having to wait.

Tank

• Be ready to taunt
• Make a mouse-over macro that taunts target-of-target for super-speedy/accurate taunting
• Turn on target health bars (they turn yellow if someone other than you has aggro)

Necrotic

Healer

• Keep the tank topped off at the beginning of each pull
• Use damage mitigation abilities toward the end of the pulls when healing is less effective

DPS

• Focus target enemies (prioritize high-attack speed enemies first)
• Use AoE slows and stuns to give the tank a chance to clear necrotic stacks

Tank

• Utilize stuns, roots, fears, fight mechanics and speed boosts/pots to clear necrotic stacks on longer fights by kiting

Bolstering

DPS

• Damage targets evenly so that they all die within seconds of each other.
• Switch targets frequently, if necessary

Tank

• Avoid pulling strong mobs together with packs of weak mobs.

Raging

DPS

• Focus target each enemy. Avoid cleave or AoE, if you can.

Quaking

Everyone

• Stay spread out

Explosive

DPS

• Switch to the orbs and focus them down the instant they spawn

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If you do the above things. Your healer will have a regular time instead of a horrible time.