A quick search online shows there are a few projects that have attempted to do this, but most are archived or left unmaintained so I'm not sure how effective they'll be but it's worth a try:
I disagree, graphical user interfaces need to find a good balance between design, simplicity and usability. And that is highly subjective: what is simple and intuitive for one person is bloated and complex for the next.
As a very popular example think of Photoshop or Gimp, both image editors and both notoriously difficult to learn how to use. The opening statement in this thread asking for a simple, light GUI says it all.
But as with all things, there's a time and place for everything.
In any case, the terminal is not reserved for the brightest computer science graduates. It's just an interface like any other to interact with, and as with all things that are new and unfamiliar, it takes some time getting used to it.
I think you would benefit from taking the time to follow along that tutorial you linked to, it looks pretty straight forward and every step is explained along the way. You don't need to learn how to use this tool from A to Z, just the options that you need.