A director who purchased Captivate for her team asked me this yesterday: "So, what's the difference between Storyline ('cause I mentioned using Storyline) and Captivate?"
My thinking is: If I want to make a video, I use Camtasia (not Storyline or Captivate). If I want to build an interaction, I like using Storyline, because of the intuitive approach of triggers and layers. I like Storyline's approach more than Captivate's Advanced Actions. But, if I had to make videos a lot and didn't have Camtasia, I might prefer Captivate, because it seems like previewing on the timeline is more responsive in Captivate than Storyline. And if I were to compare Camtasia, Snagit, Storyline, and PowerPoint against Adobe Creative Cloud in general, I'd say that I can get a lot more done at my skill level with the former suite than with Adobe Creative Cloud (which has the depth to do utterly amazing things; it's just more difficult, frankly).