Yes, heavily.

I use Firefox and so use an extension called Floccus[0] to sync my bookmarks via my own Nextcloud instance.

I also use a self hosted instance of Wallabag[1] to store pages that I bookmark for reading later (as opposed to bookmarking as a utility) so that I never have it happen that the article/blog/etc has disappeared when I finally get to reading it.

Can't say I know, or care, if bookmarking is fashionable. It works well for me, and with this setup I am in control of my links.

[0]: https://floccus.org/

[1]: https://wallabag.org/