My current UI in action:
I know it looks cluttered but I can't make it any more clean without sacrificing raid performance. Raid frames need to be somewhere close to my other stuff to not force me to move my eyes to corners to check health status. I need to track all those buffs and cooldowns and I need to track my dots. I feel too many try to make too clean UIs and they remove things which they seem to deem not neccessary or relevant information but that is usually because they are not good enough players to make use of what they remove.