This is exactly why I still have 20 points in Rest. Due to the 1.8 talent changes (and the regen bug doesn't hurt), I feel like I am still healing at the same level I was pre-patch.
But then again, EJ like most guilds has 8 rogues ready to go at any given point for a raid, a good handful of mages/warlocks, and 2-5 druids at most. While a druid may be able to do solid DPS with a feral or balance build, it's not exactly a unique role that is needing to be filled.
So, maintaining approximately the same level of healing while being able to add DPS as needed is where I see my role. I imagine a well-equipped moonkin would be able to participate similarly.