I actually rarely have to enable JS on pages now. Most JS-only sites can be find in places like https://news.ycombinator.com/show where people showcase JS-only sites / apps. Most are innocuous enough and are not trying to track you though, so I sometimes turn on JS just to test them out. I have a dedicated laptop for Youtube, Reddit etc. I'm well aware that sites like Reddit track you via JS, so I compartment / silo sites like that with a dedicated machine.