Even in my own experience, I’ve had only one job as an adult that I didn’t have some sort of connection at or where my network wasn’t part of why I was recruited (so even if I didn’t know people hiring me personally, they knew of me). Now, my career has largely been in roles where I’m publicly visible (and that visibility is part of the job), so I won’t try to attach that to anyone else — but even for a non-public facing role, I would still leverage my network first and foremost I think.
I don’t think it’s so much that knowing someone guarantees you’ll get the job, but I do think it makes it much more likely you’ll get to the first or second stage of an interview.
Still, positions change. I've had to do full interview rounds after strong recommendations, and I've been hired by SMS in 10 minutes, salary negotiation included. One size doesn't it all.
I am no special snowflake but I keep my network strong.