I sometimes take advantage of quantum stockpiles, though usually I burn through the stone fast enough making blocks that I don't need to use them for stone. More often than not the only QS I need is for meat after fighting off an invasion of delicious animal-mounted goblins. There's a good reason to have 6 butcher shops and 20 butchers in those circumstances. I fully take advantage of "cages of holding" - every kitten, puppy, and chick goes straight into the same cage in my meeting area. I also take advantage of "building destroyers can't destroy something overhead", though that isn't much of an exploit. After all, safe access to water outside of an aquifer would be nearly impossible without that. It only feels like an exploit when I have a dozen watchposts scattered around - trolls are apparently no match for a glass window.
For honor I usually do not: use danger rooms, make water reactors, use more than a dozen cage traps (overkill for a minotaur, not even close to enough for a siege), or make infinite metal via the coin-smelting exploit.
I try to avoid infinite water in adventure mode with the "fill from the puddle I just made" trick. Basically, I make an exception only if my adventurer would be forced to drink his own piss. But, a dozen shields? Yes, please.