Wanted to make my base walls out of obsidian, so I set up an obsidian gen. I never really turned it off, and got about 2 million obsidian in a DSU. Might upgrade it though so I can get it up to 25 million, which is enough to blanked the worldbordered server I play on
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Also I only ended up using 40k obsidian for the walls. All chiseled and hand placed
Another player on the server wanted to trade mob essence for certus quartz at a 1bucket : 1 quartz ratio. I built a farm and sent him 9400 buckets within an hour of starting it up. I did think about letting it run overnight.
I made a fully automated 3x3 chunk harvestcraft farm and autoprocessing unit in order to feed ... me. "FREE DELIGH'ED MEALS FOR E'RYBODY!"
I once built a 2km long nether road in vanilla minecraft and a junction skyscraper for it.
And whilst this is not particularily overblow, i wanted to make 3 quarry+ses an hour ago, and accidentally made 6 because I'm bad at math.