I get that.
What I don't get is why that requires Minecraft. It seems counter-productive due to complexity. A good fraction of people don't have very good 3d imagination and would finding a top-down 2d world much easier to comprehend.
Normally I would agree with that statement. In the past I tried 2D systems such as GameMaker and other block-like languages. I tried Alice the past two years which ventured into 3D. The difference with Minecraft is the kids already know it. I took a poll of the kids on the first day of class and only 2 out of 60 had never played Minecraft. That helps quite a bit with the learning curve so we can just focus on the logic. Their final grades were also much better this year and attribute a lot of that to the engagement Minecraft provided.