The Meaning of Life, the Universe, and Everything.
Every time I see a 1-block dent or outcrop of dirt, I remove it if it's an outcrop and fill it in if it's a dent, even if I have to grab a dirt block with which to fill it from a corner nearby or from elsewhere entirely.
I do the leaf block thing but through all of my Minecraft playing experience, I always talk to myself while playing, usually it's things like, "alright, guys now we gonna get some chickens for that farm so..." or "man that creepers an ugly one, isn't he?" It really depends on what i'm doing in the game at the time, this is probably why I want to make YouTube videos.
I always use the same starter house design, and usually never change from it, unless adding stories or something, and also, I almost never terraform the land, I like keeping MC how it looks, ill only terraform in caves and in water structures, yes, this means I will not even take a poppy from the ground, maybe once, but that's it.