Also keep in mind that the longest CDs aren't that long compared to other games. I think the longest I remember seeing on an average ability was 40 seconds. Most were between 6 and 15 seconds.
Some of the more extreme elite skills have CDs over a minute long, but those are so situational that you don't really have to worry about the CD. There aren't really any long CDs you want to use every time they're available to maximize DPS, and there aren't CDs of varying lengths you need to watch and use when they're all available.