I like to think of the game as a virtual LEGO world. (There have been attempts in making virtual LEGO worlds in the past, but they were way too complex to generate any hook to continue.) You can basically make anything you want with the material provided. Everything else in the game is just fluff or an appeal towards perfection.
Back in the day, you would throw multiple LEGO sets and build arbitrary scenarios. You were happy with what you had and cared more if you could create that what you pictured with the material given.
Now with the aspect of never having to scrap your old project to start a new one, you can let your imagination flow.
Many of the other users have already mentioned most of the scenarios, though I prefer the simplicity of being able to shape the environment provided to your liking.
From creating the maximum size pyramid possible in survival mode to creating pathways that exceed thousands of blocks long. There is something meditative in digging up thousands of blocks to create an underground rail system. Or creating contraceptions that you thought out from scratch.
In the end it's a fairly simple sandbox game.
@piggo @FailForward @barefootstache
Well, I joined the game when it was in alpha (it was sooo broken, lol). I wouldn't have stuck around either but, and this is extremely important, I played with friends on a server. We did the weirdest shit in this new-fangled game. Mods were coming up, we tried many various new things. I think it simply spread from there on, the game was highly moddable, you could do whatever shit you wanted, and the game is in full development so there's consistently new shit incoming.
Parents give it to their kids, they learn it, they spread it among their peers.. the game's simply accessible as heck. And if you can play online with friends, you have great adventures going!
Playing MC alone is a little bit boring, unless you've got a good modpack meant for that. The power is playing online with friends and thinking of stuff to do.
Imagine you playing with your buddies in the garden, and then suddenly think 'Hey let's build a tree house!' or 'Let's make a castle against bad guys!' or whatever. MC is the same. 'Let's do this!'