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I'm not a huge fan of Click Bars for everything, but then again I don't have 60 individual Hotkeys to remember for each individual function built into the game :)
There's 2 main reasons to use a Click Bar for something. That's A) to remember fewer Hotkeys, and B) to have a visual indicator. A lot of people will use original ability graphics; for some people this means take a screenshot and copy/paste stuff out of it into a separate image; for some people this means go to fan sites or resources like wowwiki and right click images and click Save As (note that depending on their license, you may not be allowed to re-distribute those images, but you can save them and use them for your own configuration no matter what); I believe there's also wow interface kits that will extract the images from the game data files.
If you're thinking about showing cooldowns from the actual ability button (some people do ask about this), then the answer is to use a Video FX view of the actual ability button, over the Click Bar. This only works when the ability button is in a different window though, since Video FX cannot work from the original window.
For a lot of things you might consider a Click Bar button for, a simpler solution (not "the best" solution, but for how easy it is to do this method it's great) is to use the same visible Action Bar button for some ability on each guy, and put a Repeater Region over it. That way, just clicking on the Action Bar button is sufficient. I do many uncommon things like this so that I don't need special configuration or Hotkeys for various non-combat abilities. Plus the Repeater Region can cover multiple Action Bar buttons in the same area.
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I'd add ... C) to enable you to do 2 actions at once, such as healing a character with your right hand using the mouse and a Click Bar while DPSing with your left hand using the keyboard. This is the main motivation behind the various Click Healing setups that use a Click Bar.