I can say for near-certainty that making polished-sounding EDM is less difficult than making polished-sounding jazz. I recently spent 99 hours on a 5-minute jazz piece - that's almost 20 hours per minute of polished work!
In the meantime, I've started making something that is (while still in my own style) Trance. To my ears, it sounds pretty darn good - checked with some other people, and they generally agree. It's about 2 minutes and 20 seconds long at the moment. Total time spent: 8 hours. Less than 4 hours per minute of reasonably polished work.
Using time alone, the calculator doesn't lie.
Not saying EDM is easy, period. It's not. It's just really formulaic (generally), and being 'original' seems to mean putting some extra original flair that makes it sound different. Considering with more composition-heavy genres, you need to do this a LOT more, it's not that hard to make it sound original. The main difficulty is effect/mixer-related. If you're making everything yourself, then I can see how much harder it would be. However, there's nothing wrong with using presets - they're a tool and are not taboo for music.
Oh yeah, also, playing an instrument is a lot harder than you'd think. Depending on your part, you might end up practicing for about 20+ hours per piece of music. Just going by time alone, I'd guess that this is about the same as most people spend creating the music. There's also all the time spent before, practicing your skills using exercises that aren't even a piece of music in order to get *just* the right sound. Nothing to compare that to in composition aside from maybe making random projects that aren't full pieces of music SPECIFICALLY to practice a facet of mixing or composition.