Your spec kinda sucks, first off. Empowered/Improved Healing are generally really bad talents. And 2 points in Surge of Light is generally not a wise investment, where one can suffice. You do get cool points for running with Body and Soul, though.
I'd say start running something like this:
Refined Spec
The last glyph is open to debate between Prayer and Renew. I personally feel that the Prayer glyph is exceptionally weak, but that's my own opinion.
Okay, now onto actual effectiveness output. You're right in the statement of the fact that lesser geared Druids can "outheal the crap out of" you. That's just the way they're designed on encounters. And Paladins have the single target that can't be touched by anyone else, plus their splash out, and Beacon. >.>
And it's good to know that you can't touch that, but your output "limitations" have something that neither class brings, in multi-target
burst. Druids can blanket a raid and have HoTs ticking each and every half-second, thus having inflated HPS numbers. But those don't bring people up to safe levels, they just keep them there.
For a playstyle tip, I'd actually just like to suggest find more places to use Prayer, with or without Serendipity stacks. If you can even hit three people in the same group, it's worth using a Prayer first, Circle to clean up as second. Many Priests nowadays are pushing Prayer off their bar, but that's basically making you into a crappy Druid that has Wild Growth do 100% of its healing upfront. That's bad, and a waste of your spot.