he is pretty close to what i do for healing on my shaman. However, he put more importance on GHW(Greater Healing Wave) over Chain Heal then i do.
I will open with ES, and then Riptide before the pull if possible. Then chain heal through the MT/OT to get a nice AoE heal for the tanks and melee. If someone specifically goes down quickly, then i pop a riptide on them and chain heal through them until they are up and then switch back to the tanks. I use CH here to ensure that others in the area are still receiving at least some healing.
For friendlys that are not close to one another, I would again open with RipTide and then GHW. Then once they are up, back to the tanks.
The idea here is to always be healing as many people as possible to keep the over all raid HP up. By casting CH, you will not only hit your main target for big numbers(healing amounts goes down with each jump of CH) but will also ensure that the rest of the raid is topped off as well. I use this same method whether i'm raid healing, or tank healing.