I agree that Chi usage made us very proactive--i.e. banking Power Strikes, Expel, ReM charges before a big damage phase--which was not always optimal relative to other healers. I do feel like our toolkit is a little over-simplified.
I'll reserve my final judgement after some (Mythic) dungeons and potentially some raid testing in beta, but logging into my (up-levelled) RDruid alt was a little depressing. The Legion RDruid toolkit is vast, and (I feel) provides a lot of depth: http://imgur.com/a/SmVlo (just look at my Legion MW vs. Legion RDruid bars), ignoring the added utility.