I’ve found that a lot of blogs do have RSS feeds even if there is no visible link or mention of RSS anywhere on the website. I often just throw the blog URL into the ‘add feed’ box on The Old Reader, and it turns out there is feed info hidden in there somewhere.
I’ve been happily using RSS feeds for many years. I mostly use them for webcomics. I’ve got a bunch of different webcomic feeds. But I also use RSS to follow a bunch of low-traffic sites that I care about the content of but don’t want to have to manually visit just to see if there’s an update.
Also, I don’t have a google account, but I use RSS to follow a couple of youTube channels that I find interesting. (Again, stuff that rarely updates. eg. hbomberguy.)