~~This hardly offers new functionality. The same thing can be achieved~~ Preventing entering a website can be achieved via My filters
in uBlock Origin - all you need to do is type there the domain of the website, one per line, e.g. ||reddit.com
and click Apply changes
.
And from screenshots of the addon linked here it looks like it's limited to blocking domains that are shown in google search results? That would be much more limited than using uBlock Origin.
Edit: Oh, I've looked at the screenshots again and I see the difference - the blocked domain disappeared from the search results. So yeah, it's useful functionality for people who use google.