I just went through this decision myself. I'm running 4 shaman and a friend is the tank. I have two big reasons for dual spec:
1. To have a separate set of hotbars for "healer mode"
2. Earth shield is a big win. It really let's my dps go all out.
So, I can have 3 dps going all out and one shaman healing without having to go through contortions with keys/macros. My dps rotation is easily accomplished with the first 6 hotkeys and my heals can be done with the other 6 (and a few other keys for targeting). I like to have every shaman set up the same way for pvp, so that any of them can take over as head, which makes it a little difficult to be set up to dps and heal from the same hotbar.
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