You already made your decision and I think you made the correct choice. Still, this is a topic near and dear to my heart as I raid with a Holy Pally.
You wouldn't see a difference in five-mans because you can beacon the tank and heal the rest. That said, you wouldn't want to exclude the possibility of raiding even though you say you'd be most likely healing in five-mans.
We have a great core of healers in my guild, at least two really good healers in every class. I was in an 8-man Naxx10 run the other night that we still have to finish and in clearing three quarters (spider, plague, construct) the tree healing with me so far has doubled my effective healing. I'm even sure that except in one or two limited situations, such as Gluth where you just need two healers because of the ground one would have to cover, he could have solo-healed the run so far. I have that much respect for him. And I told him that in vent just before we broke the group for the night.
Now, granted there is a lot of skill involved here with this guildmate I'm referring to; I'm simply trying to point out that drood healing is awesome. Personally, I'd rather have a drood with me than any other class. And droods just look cool in all their various forms!
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"the people can always be brought to the bidding of the leaders. That is easy. All you have to do is tell them they are being attacked and denounce the pacifists for lack of patriotism and exposing the country to danger. It works the same way in any country."
Hermann Goering, April 1946.