Healing UI's/Addons

[DJCDude88]

Hello, I'm a 70 Draenei Shaman now specced resto. I'm still somewhat new to healing and while I can usually do my job fine with the current UI, I get the feeling it's more DPS-oriented. I've looked as screenshots from other raiders and see stuff that causes me to wonder what it is and if it could help me. One example of that is that raid group setup thing that looks like a bunch of square grids, I see alot of healers with it, no idea what it is though.

I was wondering if any healers (Shamans especially ) would like to share what they think greatly helps their healing efficiency, specially in raiding situations and such, whether it be just their UI setup or any particular addon.

Any input would be greatly appreciated (screenshots for ideas would be great too! ) Thanks!