Below are some advice for player to help your healer do their job,
1. Please stay group up. Unless you are confident that u wont get hit or damaged or u do not need heal. If u does get hit for some reason, run back to your group to get the heal. Why? Because healer's healing aoe has a limited circle of radius. If u stayed too far from each other, the healer need to spam multiple heals to keep the group hp up compare to just one heal if u stayed group. Spamming unnecessary heals are dreaded by healer. It drains the hell out of divinity for no reason.
2. Don't panic and stay where u are. For some reason when the aggro is on someone, they started to dodge/run in every direction across the map. Subsequently, they dodge every heal u toss at them and complain the healer aren't doing their job. Be patience and tank the damage for abit so the healer could get off their heal on u. Dodge only when its an attack that could 1 shot u from full hp. Dodging heals is one way to kill the group. Not only u drain and waste the healer divinity by not getting the heal in, u divert the healer attention away from the group.
3. Try to stay in healer line of sight. The tip is stay near to the one with aggro ( usually the tank ). This is especially helpful for the healer in a situation where u are attacked by adds and the healer need to keep an eye on both of u and the tank. Or during Acturia phase when u get cocoon, at least the healer sees it. Saves the healer time to look for u.
Its not just the job of a healer to heal. It is also your job to let the healer heal u in the most efficient manner.