Working on Lich King 25 today with my raid alliance and decided I needed to rearrange some of my ui elements to make it a bit easier to track defiles and such. I haven't done Lich King on 10 or 25 that much on my druid and I was finding that while my ui on her is fine for most fights, it was hurting more than it was helping on LK.
For boss mods, as I mentioned before, I use Deus Vox Encounters, which I love for its configurability. Today I found another reason to love it - it works with MikScrollingBattleText (which I admit to being a relative newcomer to - I felt like I was doing okay with the default floating combat text but enough people recommended MSBT to me that I figured I should give it a shot). After playing with it a bit (plenty of wipes and DCs today which gave me plenty of time to tweak things lol), I think I'm pretty happy with what I came up with.