I used to think a torque wrench was just for carbon parts
Spent about $90 on a basic 5Nm Tekton wrench last year for a customer's carbon seatpost. It felt like a lot for one job, but then I used it on an aluminum stem and realized how many bolts I'd been over-tightening for years. The click is so clear, and I haven't stripped a single thread since. What's a tool you bought that you now use way more than you thought you would?
It's crazy how a torque wrench makes you realize how much you were just guessing before. I started checking things like water bottle cage bolts and rack mounts after that first stem job. Now it feels weird to tighten anything without hearing that click.
Honestly I've had the opposite experience. I used a torque wrench for a while and it just slowed me down for simple stuff. You get a feel for it after working on enough bikes. My bottle cages have never fallen off from hand tightening. That click just becomes a crutch for things that don't need that much precision.
Watch a guy strip the threads on a carbon seatpost clamp ONE time and you'll never call a torque wrench a crutch again. That click is the sound of not having to explain to a customer why their fancy frame is now a paperweight. Some of us like our bikes to stay in one piece.