An odd search has surfing around on the blog stats; “why does bonus healing go down when in resto spec”.
My first response would be something like “What? What the… What?”
Assuming the search isn’t about Shamans (though it could very well be), I can imagine as well that someone is comparing his or her +healing on the character stats screen in Resto spec to a previous Feral spec.
If before swapping spec you were feral, probably leveling and trying out talents, there’s a possibility you got a combination of SotF and Nurturing Instinct. Nurturing instinct increases your +healing by a certain stat (now Agility, used to be Strength?), and SotF increases base stats that could increase your healing.
It shouldn’t worry you that the +healing is going down, because you’re going to increase your healing by using full +healing gear. And your resto spec is going to be the silent force behind your healing abilities by increasing its worth in actual healing. Where you had for example +100 extra healing out of +500, the resto spec will make your +400 healing be worth about +550 healing for Healing Touches, +550 for your generic HoT’s, and not to mention an extra +15% of healing done for Rejuvinations. And this will all increase as you increase your main healing stat, as opposed to the less abundant strength and agility.
So I think I can safely conclude that freaking out over the visual statistics isn’t really needed, and you can safely stay resto 
/edit; See comment below from Kriyet of Bladefist in case Balance was the previous spec \o/
Actually, I noticed this in my stats a few weeks ago when my guild hit Kara and I was jumping from Festo on raid nights to Balance to do my questing.
When I was checking armory one day, I saw my bonus heal was higher than I remembered from raid night. Yippee!
Then raid night – ack! Why is my +heal suddenly 75 points lower? (I don’t remember the actual number.)
I spent a bit of time checking talents and making sure I had my gear the same, and here’s what I found.
If it’s happening to you when you move from resto to balance – the culprit is probably Lunar Guidance:
Requires 20 points in Balance Talents
3 points: Increases your spell damage and healing by
25% of your total Intellect.
Most of us have a decent pool of INT with our resto gear, so, even when we’re not resto specced, with our resto gear on, we’re cranking respectable +heal. You can definitely see why Dreamstate/Intensity offers a viable heal build when it includes Lunar Guidance.
Kriyet of Bladefist
Oi, you’re so right! I totally forgot about that talent. Though you still gain more from the hidden +% from the resto talents, it’s just the number that seems awesome.
Thanks for the reply
I jumped into an impromptu Karazhan run with my hunter a week or so ago and another druid lamented the same thing: she had less Bonus Healing as Restoration as she did her previous spec (I think it was Balance). Not having played a druid extensively in the past, I just assumed that she was crazy or a neophyte.
I’ve learned something new today!