For many people, myself included, stance dancing and DPSing in between heals is half the fun. I'd be bored out of my mind if I spent an entire dungeon doing nothing but casting cure or waiting around. It's one thing to spend most of a boss fight curing. I'm fine with that because you're also dealing with mechanics and stuff. Dungeons aren't only bosses though. Does anyone really want to fight trash so hard that healer is forced to spam cures non-stop? That sounds way more annoying than fun.
To be honest, I'd like to just fight less trash entirely.
Trash is boring. Very rarely are there mechanics, and it's the same thing over and over again. Pull big group, AoE them down, pull big group, AoE them down. Occasionally dodge attacks, or once in a blue moon like Sohm Al (Hard), use environmental junk to help kill them faster, still boring.
IMO, 1-2 trash pulls between bosses. Shorten the dungeons a bit. Do they need to be 30 minute slogs? That's why I love Trials more than Dungeons. Trials, you show up, pull boss, kill boss, done. No boring trash.