One thing I've noticed that is the same with almost every UI is it's main set-up is like this:
The action bars and unit frames are in the center because it's very close and provides you with your health/rage and cooldowns at a quick glance. Most people also keep their chat on the left side. I think this is due to most people being used the it on the left as it's the default. It's out of the way, but is easily readable if you need to focus on chat.Other UI elements that make a UI unique:
- Addons that enhance the UI
The minimap is usually changed multiple ways. It is usually unlocked and dragged around the screen to fit the rest of your UI. A lot of people put it down at the bottom near, or in the center of their action bars.
For addons that are a lot of addons that are used. To name a few: Art, Buffs, Cast bar, CC, Cooldowns, Damage Meters, Fonts, Minimap, Unit Frames, PvP, Viewports, Threat Meters, Tooltips, Action bars, and plenty for enhancements.
I've just made this thread in hopes to spark discussion on how you like to set-up your UI (and why) and to see some discussion on how to accomplish a functional and good looking UI.