Even as a huge advocate for DPS'ing as a Healer, I don't see throwing rotations into the mix as a positive. If it's so difficult/undesirable for some to understand that contributing damage is a positive (when it's currently so easy to do for pretty much all versions of Healer right now), then throwing in rotations to complicate matters further (no matter how drastic or minor) will only effect those who are actually optimizing (negatively/positively - depending on situation vs preference), while muddying the waters for everyone else.

I can't speak for every WHM, but I never get bored with mine. All groups are different, thus all groups provide a very, very different opportunity window depending on factors outside of my control (which keeps most situations relatively fresh, even in content I've repeated 20million times), whereas when I play DPS, most windows are typically the exact same, provided the tank simply has aggro. As a Healer? Will this tank be mitigating? Do they have the gear to allow regens to handle their health while I throw out more stones? Will they force me to heal a little more because they, too, want to do some damage? Are they generating enough emnity? Are the DPS successfully avoiding mechanics to give me more freedom to do damage? Does this fight require more of a proactive or reactive approach (or both) to Healing?

The more oiled the trinity, the more I can contribute as a Healer. I like dancing that line, even if the variables tend to lay with everyone other than myself - it's fun, keeps things fresh, and doesn't require being mindful of rotations - something I have to be when I play DPS (and would prefer it stayed that way). We already have to be mindful of everyone else and their situation just as much as our own, even if pure-healing. We have to be both proactive AND reactive, whereas a DPS mostly just have to react, and Tanks have much smaller proactive requirements (mostly tied to themselves and their own cooldowns, with exception to emnity checks or tank-swapping).

I'd be more inclined to think that Healers could be kept the way they are (easy DPS contribution) but spiced up through passive-play such as their SB mechanics.

EDIT: I'm glad Vryiah was joking about the whole "I killed it" thing. It's neither dead nor stoppable by one person. If anything, you were riling people up and keeping it alive (and I don't say that in a derogative/insulting manner).