I choose to see every post on my (small country) instance, so if there is an echo chamber, it's an instance-shaped one. Which I like - I see the range of views prevalent in my small country. "Elite" posters depend on posting good content and are rewarded only by other people boosting their posts.
I tend to use Mastodon which makes finding a post's popularity a click away, and so emphasises posting for interest instead of outrage. This may also be an artifact of living in a small country that expects more civilised discourse from it's citizens.
Having no algorithm definitely makes the Fediverse more "boring" - I had to persevere after moving from Twitter. But I soon realised this was due to the lack of outrage, and that that was what I wanted, and what I was seeing was far more "real". Big fan now, and it's made my social media consumption a lot healthier.