Depends on what I'm running. For mixed teams I rarely have any visible action bars. I track CDS through addons so I don't see why I would need any. For teams consisting of only one class I run some bars. I only really have things with CDs visible though... No need to see Moonfire on my bars since it's always castable and I know the bind.

That's kind of what I try to do with my UI now. If it does not tell you something you need to know, hide it.