As a 6-7yo I had a collection of English words, stored with my own definitions and pronunciations, using basic building blocks, and it was as easy and intuitive as writing these words in my notebook.
People used the same building primitives to make real games or stuff like accounting applications.
And the best part - at that time it didn't looked cheap.
This one is really hard to describe - it's the same uncanny valley that makes small village in Fallout 1 feel massive and full of people despite it taking two screens with just few sprites running around, while full blown 3D world of Fallout 3, with real buildings and voice overs felt flat, soulless and empty.