Nah, cause at least you're using all of them all the time. Maintaining your rotation in the face of mechanics that want to interrupt it is the fun of DPS, and extra damaging abilities only add to that challenge. You have a precise order you've set up to make sure you're using all of your abilities as soon as you can, and you need to make the encounter work around that no matter how much the encounter tries to stop it from happening. Healing is the complete opposite. You never want to use it if you don't have to, and you're relying on the encounter itself to give you permission to use those abilities. The boss tries to stop DPS from using DPS abilities, and it tries to force healers into using healing abilities.
Problem is, there just isn't enough outgoing damage relative to the bloated healing kits, so the choice about which spell to use isn't very important. You can think of it like this: imagine if you're a level 58 DPS that's bored waiting in queue for Palace of the Dead, so you decide to go out and walk around killing random gazelle outside Quarrymill. For the first one, you're probably going to pick an instant oGCD to one-shot it with. As a RDM, I would kill the first one with a Fleche. Second gazelle, I toss out Contra Sixte. Third one I kill with Corps-a-corps. As you can see, it takes a lot of gazelle to make me start hard-casting Jolt. If it's already been 25 seconds since I killed the first gazelle, then my go-to spell becomes Fleche again, and if I continue at this pace I will probably never reach a point where I'm casting Jolt.
Healing opportunities are rare, fleeting, and the game decides when and if they happen. If there's no gazelle around, that Fleche will sit off cooldown until I find one. Now imagine that I'm constantly taking some form of heavy poison damage during my hunt. The moment a gazelle appears, I'm ready to Fleche it. I've been waiting to do that. But I can't do it until it spawns. In the mean time though, I'm taking heavy damage over time. This leads to me casting Vercure over and over until a gazelle spawns. Despite the fact that I have a wealth of DPS buttons at the ready, I'm spending 70% of my time casting Vercure, my one heal, interminably. The rate at which gazelle are spawning is making my high-priority attacks come off cooldown before I can even consider using the less powerful ones. Vercure Vercure Vercure Vercure Fleche, Vercure Vercure etc.
This is what they've done to healers currently. A DPS with a large suite of DPS spells is using all of them all the time if they can help it. A healer with 20 healing spells and 1 damage spell is going to be using the 1 damage spell until the scripted encounter decides it's time to use a heal. Well, if that opportunity is one measly tank buster in a 30 second time period, I'm just gonna throw an Excog out and not worry about it, because the game's going to tell me ahead of time if another gazelle is about to show up.