FWIW I asked the same question last time a uv thread was posted (two weeks ago) - got some legit answers, none that swayed me personally but I can see why people use it. Also lots of inexplicable love for it https://news.ycombinator.com/item?id=45574550
I agree that the speed improvements are inexplicable, as in I can't convince you in writing. "uv is fast!!!" doesn't do it justice. You kinda just have to experience it for yourself.
If you haven't spent 5 minutes trying it out, you don't know what you're missing.
If you're worried about getting addicted like everyone else, I could see that as a valid reason to never try it in the first place.