I finally figured out how I must play this game.
As noted previously, I don't care much for the building stuff aspect, so far. I like to spelunk. (I like to say spelunk. Spelunk.) But I found I was getting careless. I still get spooked by the sound of arrows piercing the darkness, and I maintain safe mining habits, but the hubris was building. I'd explore into far too dark of areas, carry far too little food (need that space for minerals, after all), and wander much too far from a safehouse.
Eventually, just as I first found lava, I was struck down by a Skeleton, my spoils littering the bedrock. As I respawned in my beachside shack, my chest containing only the most useless of materials, I thought, "well, fuck that shit". If I'm going to start over, I'm going to start over.
Gentlemen, I have turned Minecraft into Nethack. If I die, the world dies with me.
I've gone through three worlds this weekend. I don't think this approach is really helping.