OH MAN! Talk about a question that has infinite answers. First and foremost, what addons you use are completely up to you but I will state the addons I use for my Restoration Druid. One addon I love is VuhDo I like this better than Healbot because VuhDo is much more customizeable in my opinion, allowing you to have Buff warnings, threat warning, inc heals, heals, display of icons to your choices (where your HoT icon will be placed on the name plate) and much much more! But I also use Grid, you will see that many Healers like to use 2 Raid Frames, I use Grid for Battle Rezing so I can easily select the player I wish to bring back from the dead, along with being able to set player foci more quickly. Also I like to use PitBull because I can create and customize my own party name plates, move them to my liking etc. I also like to have Satrina Buff Frames its a great way to organize all your de/buffs you like in your personal way and show them anywhere on your UI. Also I use Dominoes for my action bars because I always need more room for all my spells. Also a great addon would be Power Auras because instead of searching through your buffs and trinkets and wondering if your spell proc'd anything PowerAuras provide you a visual effect letting you know when something happened/avaliable for example I have Wildgrowth as one of my PowerAuras everytime I cast it I have 2 half circles pop around my character tunnel vision and once they go away that is when I know my wildgrowth is off CD, you can do the same thing with Swiftmend and Omen of clarity. There are both tutorials for GRid and PowerAura set up's by our lovely Aliena on Tankspot.
PowerAura Tutorial can be found here: http://www.tankspot.com/showthread.p...Auras-Tutorial
Grid Configuration Tutorial can be found here: http://www.tankspot.com/showthread.p...-Grid-Tutorial
I hope you have the best of luck finding the AddOn's that are right for you! If you need anything else please don't be afraid to ask! GOOD LUCK!