ive been playing this game since 2011 when i was in middle school and im still coming back to it. im sinking hours into it after work while my puppy sleeps next to my desk and my gf is working evening shift. its such a cozy game and reminds me of when i spent all day after school playing MC and other games w friends. its not just nostalgia tho, its just such a cute game that can be whatever the player wants. after all this time, i still derive so much joy from exploring a new world, building a sprawling estate, spelunking, and even just mining. even tho MC doesnt track ur hours played, im certain its my most played game
just wanted to share that i love this game 
It's funny but I'm personally the opposite, I find the underground really fascinating for the purpose of exploration.
I like caves too but I don't like how infinitely sprawling they are. I get kind of anxious when I think I've mapped out a cave system only to discover an opening leading to another one that's 10 times larger, which leads to 10 other cave systems, which open to 10 more cave systems, etc