Granted I haven't been playing this game very long, but from just playing around with the various features on the UI I have seen some things that are more of a hindrance instead of an enjoyment, and some things that are just plain out redundant.
Please keep in mind that I did look around a bit to see if what I am going to be writing about can be done, sadly I turned up with empty hands.
White: We already have a visible red and blue bar, is there really a reason to have two on the screen at the same time? My suggestion would be to give players a choice if they want this secondary one to appear or not.
Red: Can we have a way to make this one visible or not visible? Also why is this one visible if we have the mini map on the screen? (Pressing the M key) My suggestion would be to give users a way to open / close this on the options screen or perhaps similar to what users have for the quest box.
Teal: I am not sure how people have put up with this for so long, having that pop up and cover their screen. I can't see how that would be enjoyable for anyone. (Perhaps those that it matters, but I wouldn't think many would find it enjoyable) My suggestion since these messages already appear in the chat box, would be to give users an option of seeing it visible in the play area or not.
Black: If a user has chosen to hide this interface, why is it still a box that is just sitting there being an eyesore? I suggest giving users an option of seeing the quest box or not.
Purple: I have a couple comments about this area as well as some suggestions
A. Give users a way to fully turn it on / off
B. Have a way to save settings from session to session. If someone has left a channel, why do they have to keep leaving that channel when they log back in?
Yellow: This one touches a bit on the area outlined in white. Why are there so many places showing the same information? Granted the Yellow outlined areas have other information, but why so many places for red and blue bars? Suggestion would be to consolidate this information and redo it so all the information is in a single area that is more appealing visually.