Don’t know if it qualifies as “cool” site, but I moved my personal blog from WordPress to Hugo - was quite some work transfering the ~1.000 articles and all the media.
Main reason was that WordPress and my personal needs grew apart during the last months / years and I was looking for a solution that better suited my needs.
The theme was also migrated from WordPress with some small changes here and there, the search and comments are PHP-based. I wanted to minimize the use of Javascript as much as possible, only Javascript-component (and only 3rd party component) is the lightbox script.
Thanks for sharing and welcome here,
if you plan to use Hugo to publish audio and video, this ongoing project may interest you: https://audio.phoni.es/
I’m using it to collect and share traditional songs, here is a recent page, in french: Heyamoli | Phoni.es