I've been a hack myself plenty of times...lawn mowers, HD suspension parts, and some things I just didn't want to mess with a torque wrench. I do, however, use mine quite a lot.
Do I use one EVERY time? Nope! But, if I'm paid to tighten something, I torque it.
I saw a drain plug come out of the rear oil pan on a Cat 3516 once while under full load.....the engine was turning at 1900 rpm and because of the oil demand at full pressure (and probably being a little low on oil), prevented the front pan from keeping the rear pan full enough to keep the pump primed....it was all over before the low oil level sensors could detect. Damage was limited to bearings and crankshaft. A new engine and 6 weeks of removal/replacement brought it back on line. $20m dollars in lost production and $250k for engine replacement. A simple loose drain plug caused it all.
Sorry to bore you with the story but....I torque!!