Just read your post and a couple of the others. I agree and disagree with some things said. Being a resto druid since Vanilla WoW, I thought I would share my knowledge of what I've gained playing one. I play a little bit differently than the guy above.
Starting off, I love the new effloresence. Sure it might give away that you are a resto druid but hey, we are resto druids since when do we die. I know it might not seem like that now only being 63, but trust me, you are the most OP healer in BGs right now. I sole-heartedly love swiftmend and have been a fan of using it in dire situations. Efflorescence gives an AoE heal to those guys who are slowed running in 1 area for a long time trying to kill another dps. You see it all the time, especially if they are fighting a DK or Rogue. It works, trust me. As well as yourself, you are a mobile healer but you can also heal through a single dps attacking you. Throw your hots up, toss up that swiftmend, proc the Eff, and let the numbers fly while u heal your team.
Also I disagree with what Untip has said about regrowth. Currently I rocket off regrowths in 1.24 seconds with them hitting for at least 11k+ heals. It takes time and gear as you acknowledged earlier. Once you get the gear you will realize how easy it is for us resto druids :). One ability that you should always have on a target is Lifebloom. Find the guy who is getting the most work done in the BG and throw it on him or even yourself, since if you don't live then neither does the other guy.
One of my favorite abilities that most druids forget about and I laugh at is Nature's Grasp. IT IS AMAZING. Those pesky rogues don't stand a chance when you pop it. Use it when that dps finally sees you standing over there healing and comes after you. Hit it, travel form, get away. Works all day long. And if they catch up to you, guess what, it's still active. Rinse and repeat :)
With the new Rated BG's coming up, being noticed as a healer, especially a resto druid, if they see a druid in normal form, guess what they already know ur a druid so any more signs of there being one doesnt really matter. With your Rated BG team if you ever get into pre-made teams, there will be 1 rule established for you being a healer, all dps keeps you alive. Like i said we are the most OP healers in BGs right now. Sure priests can bubble and bubble some more and fear and oh theres another bubble but they cant last against multiple dps at a time. Numerous times I have been in a BG with one of my lock friends and we repeatedly went 2v5, 2v6, and win because of the heals a druid can put out. Oh and instant Regrowths in tree form, oh it brings a tear to my eye.
As for spec, I am more on the defensive side than Untip. You can check mine out for an example but fyi, I use mine for raiding too, It works both ways. This doesn't go to show that I dont go offensive from time to time when the heals arent needed but they just don't hit as hard. At lvl 80 as well, there isnt much time in BGs anymore that you spend standing around NOT healing. So offensive type abilities I leave for the 2v2 Arena team spec.
If you have any questions just give me a holler.