I've found that I really don't need to spam much for my shamans DPS. With the abundance of critical strike gear and 3-4 ToW they almost always are critting and procing additional bolts, so I spend more time on the tank or on the shaman positioning.

I can see how AoE teams really rock right now in normal dungeons, and almost wish I had gone that route; however I'm not sure yet of their viability in heroics.