It's funny because I was thinking about how reading and commenting can help you find ideas to write about. I was stuck coming up with a topic to write about, so I just read more articles today than I usually do. And I already have two ideas for topics I didn't have before.
I already felt it impacted my follower count growing, as I picked up several followers from my comments before publishing my first story. It seems that engagement is key to succeeding on Medium in a few ways. And being authentic about it, too, of course.