I've enjoyed the new height limit to try my Creeper farm prototype (which worked but has since been redesigned to be a gunpowder/bone/arrow/rotten flesh collector).
I've also liked being able to secure my vault with a Golem or two.
The biggest "natural" change I've made to my gameplay is having a cat (*sigh*, I'm a dog person) follow me when I'm caving to help keep the creepers away.
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