I figured I'd post this since I haven't seen many (any?) other druids using pitbull for raid healing. Core of the setup is pitbull 4 and
pitbull_aurabar, which enables you to create custom timer bars on individual frames to track buffs/debuffs. As far as I see it this has two advantages over Grid:
1. Hot timer bars, instead of dots or numbers in corners. This is less relevant to other healing classes with fewer spells to accurately track the durations, but with rejuv/regrowth/lifebloom I find it's preferable.
2. It takes less mental 'translation time' to process purely visual cues than numbers or dots. Of course this varies with familiarity with your own setup.
The obvious downside is that pitbull takes quite a bit of time and familiarity to setup and tweak to how you like. However it's incredibly powerful once you're familiar with the options.
Raid in combat, with custom frame highlights for penetrating cold:
Zoomed in explanation of the aurabars on the MT:
Raid out of combat. I leave some space between frames for seeing fire on the ground behind me:
The red frame highlights are set up for all the random debuffs which in effect mean "this person needs heals". Frost Blast, Penetrating Cold, Impale, Legion Flame, Incinerate Flesh etc. I add/remove them depending on the content progression and how much I need to care.
Everything else is pretty self explanatory. I've been slack in tidying up the other aspects of my UI, but seeing as raid frames are the #1 thing I care about a fair bit of time has gone into them. Also- to pre-empt the question about why I have Omen showing- this is an alt run with perenially aggro happy warlocks. Gives me a chance to yell at them before they pull. Recount is for spell use analysis and ego stroking on Twins. Bars are dominos. Only reason I have them showing is that I use the same UI setup for 6 specs across 3 classes and often forget what my bindings are!