For me the most important info is what happening in game. Targetting windows and some others are too big for me- taking too much of screen space, group window sucks cause cures located from the side and not under player name and names located too close to each other in window. Bottom bar doesn't work corerectly with widescreen letterbox, however i like most parts of this UI and it's just a question of personal preferences.
There's alot of alts for epic updates etc on this raid. And as i said my hotbars looks this way because i almost never relocated spells on em since lvl 20 or so and it's been 2 years ago since then
If i reorganize my hotbars i won't be able to play good for like a week or so untill i get used to it. I have some weird geometric figures for my casting orders, but i can do em with my eyes closed ( using mouse to click on hotbars, keyboard only for typing and movement keys).