I use NoScript, so I can give you an idea of what it will be like.

A large number of sites will just fail to work (in unexpected ways). Many sites will also look terrible or the layout will be a complete mess. Lots of sites will still display their content and for those that do, you'll probably find they load faster, but they will also probably lack a lot of functionality and often content will be missing because javascript is used to load content from other sites into the page. One particular annoying trend is sites that use javascript for links.

More and more sites these days won't even display a single thing - even for displaying text because for example they use client-side templates or make Ajax calls to load the actual content.

Javascript has its uses, but so many sites abuse it heavily. Not to mention it's a massive attack vector for malware and tracking of all kinds.