ok.. I've researched around... and I am feeling I need to change my warlock's UI... just at the very least to break old/bad habits (glancing up to the unit frame for DF even though I have the info in the middle of the screen.. glancing at the action bars at the bottom even though I have dot and CD indicators in the middle, etc)
is there a strong minimalist UI that other locks (or any of you guys) strongly recommend over any others?
If you aren't used to UI management and creation... it can be a bit daunting. I normally initially spend a couple hours just setting it up... and about a month refining. I'm a bit anal when it comes to UI. Information is very important in this game... and I like making sure that everything is available to me when I need.
That said - I like clean looks. I'm at work so I cannot show you mine right now. I'm a mage... unfortunately I am not familiar with Warlocks. What I can assist with is some great addons that have really helped me.
I use Bartender my bar addon. Fully customizable. Gets rid of the WoW art. Allows you to size and move your bars ANYWHERE on the screen. Opens up a ton of space. Will make your UI as minimalistic as YOU want.
I use Quartz for my cast bar addon. I never liked the stock cast bar. This allows me to set the size and placement for my cast bar. Gives me a little more information too... such and latency and target's spell casts. So... basically... it frees up some space or places it in a very concise area. Again... full customizable.
I use Shadowed Unit Frames for unit frame addon. Now... I used to use Perl. But that's gone now. SUF is pretty simple. Cute colors... but bold. Raid UI is clean and I can make it small (I don't need much raid UI info... I'm a mage). There are a lot of additional informational thing that can be done with this... but I keep it pretty stock.
I use Weak Auras for extra information. All this does, for me, is provide me with text alerts. As a mage... I want to know how many stacks of Arcane Blast I have. I simply created an aura alert that shows me how many stacks. Pretty slick. Keeps the information right where my cast bar is. Weak Auras is daunting tho. You will have to play with it to have it do what you want it to do.
I use Tell Me When for CD management. I really love this addon! I broke a rule when I started using this addon... I placed extra buttons around where my character can be seen. But... as far as simplicity goes... it's great. The icons will pop up when the spell is off cooldown... or keep track of charges. I have also set a couple of my spells to give me a sound chime when they are off CD. What's great for me... I set the opacity so I can see thru the icons. Useful.
I use Prat for Chat Windows and Sexy Map for map options. Obviously DBM for Raid information (remember... much of the DBM information can be altered within options. Don't have DBM overlap you other addons. This is why my UI management takes time... I need to learn where my stuff is and if its useful. Trial and error is your friend).
Good luck! A good UI will make you more effective. Good keybinds will too! But that's a whole different story!