Musicians learn other people’s music, and then use it to create their own style. Architects, painters, writers, chefs, follow a similar trajectory. But even if you are not Beethoven, you have probably acquired skills this way. Carpenters, teachers, mechanics.
When it comes to presentations, use this process as well. Develop a (very small) set of slide layouts that you know how to use well. It becomes a visual vocabulary that you can use to express pretty much anything.
This is why people that spend some time at a management consulting firm can churn out all these slides without effort. This is why simply copying a slide template out of the blue and trying to fit it to your situation rarely gives good results.
SlideMagic has done the hard work for you. You get a consistent style that you can adopt as your presentation style, and each slide is simply a small tweak of a language you have learned to understand.