Healing doesn't really have a rotation of spells to go through like a DPS spec does, however, there are often certain types of situations that arise where you can respond in a certain fashion. I've detailed some of the most common situations below, as well as how to heal them. In the heat of battle, you may not always be able to stick to these things exactly, but with a little practice they should become second nature.
If you have any questions or feedback, you can leave a comment below or contact me on Twitter @PrestonDvorak.
July 8, 2017 - Updated Grid settings to include Tomb of Sargeras boss debuffs.
June 15, 2016 - Finished simulations for Large-group Healing trinkets and legendary items - those lists have been updated.
June 13, 2017 - Initial 7.2.5 review. Expect more updates in the coming weeks.
May 2, 2017 - Added "Other Notable Addons" section to the addon's page.
April 27, 2017 - Updated all best in slot lists to accommodate Aman'thul's Wisdom being a top legendary choice.
April 21, 2017 - Made a very small update to the Grid saved variables on the addon page.
April 16, 2017 - Moved Aman'thul's Wisdom up the legendary BiS list. It's performing very well in real-life logs. Updated Grid saved variable file on downloads page.
April 6, 2017 - Fixed BiS trinkets for large-group healing being out of order on the page and in the spreadsheet.
March 31, 2017 - Completed the full 7.2 gear and simulation overhaul for best in slot lists, trinket rankings, etc.
March 26, 2017 - Updated Talents and Builds page with new talent system that supports displaying multiple builds. Added information for Raiding and Dungeon/M+ builds.