Niether did I, my mate still laughs at how into it I am following my initial response to it.
There is a few things to understand about it.
1, use it as a construction engine and make buildings of your own design and well... Whatever you can think of.
2, similar to the first, use the games version of circuits to make electronic devices such as hidden doors or computer games, on my server we have a fully automated and playable connect four board which will soon be clever enough to know when someone has won.
3, survival mode, stay alive and try to complete it, do all the things needed to get to the hidden "end realm" and fight the boss dragon. To this all legitimately will take as long, possibly a lot longer than most other gamestake to complete.