Well numbers are a crucial element for the feeling of fun because all fights all designed around them. No class nor spec can be designed solely around how cool it looks. It has to be balanced around the available content.
I first tried it in a couple of dungeons, mainly for damage purpose. I’d occasionally throw it on the melees (pretty much the tank and myself) for a boost of heal and didn’t pay attention to any numbers. I expected it would increase my throughput but couldn’t notice any change. Nothing struck me out about the ability, I just knew I had an extra button to push. The day after I installed Details and did some testing around dummies. Only then I realized how little it was increasing my damage and healing (cleave bug aside).
I don’t know if it answers your question, but I think it circles back to the duo flavor/numbers: both are needed, and at the moment the ability has some flavor but no numbers.