You have to save passwords manually, that's true, but I only need to add a password about once a month myself so it's a good tradeoff for me.

There are certain news sites I visit that are littered with video so I use toggle JS option there mostly. I might read 5 or 10 stories off the main page and once JS is disabled globally I can just open each page in a new tab, rather than having to copy and paste 10 pages into the web-based JS. That is where it would be laborious for me.