One thing I love to do is to block all the garbage of websites with uBlock Origin by adding my own filters. That does not give a result as good as this project but it quicker to do.
Yes. One example where this worked particularly well for me is the Youtube homepage, where I blocked all the content so only the search bar and sidebar are still visible. They've since changed the html and I have since made two workarounds for the homepage, but for years that saved me from getting distracted by all the crap people watch and forgetting what I was going to search for.