The Hero's Journey has become a bit ubiquitous in lots of genres. I haven't played Journey but I have, for example, read a book about utilizing the hero's journey to write novels and screenplays. The Hero's Journey played an integral role in George Lucas crafting the original Star Wars films, for another well-known example.
Some dislike this because they think it reduces storytelling to a specific template. I'd argue that it does that only in the wrong hands, as the particulars and myriad permutations of the journey make for near-infinite variability. But once you're aware of the basics, you do start to see a lot of it in movies especially, but also other forms of art on occasion.
I'm in communications/marketing, and have also been a freelance writer. Literally everything I do ties into the idea of narrative in some way. So I understand and agree with you wholeheartedly on narrative, and how it shapes our understanding and approach to nearly anything. And yes, it literally can change the way we think.
And it's not mystical aspects, per se, as that implies somewhat specific beliefs. But I first encountered this firsthand as part of a Greek organization. The initiation rituals and tennants mirrored those of numerous ancient esoteric traditions. The Masons are another well-known example with similar rites and codes. It doesn't require the supernatural, but is - at its core - a vehicle for creating awareness of personal ideals. Usually they juxtapose these ideals with the materialistic outside world, which doesn't cater to the "higher self." Whether to find comfort, solace, strength, or many times to literally transcend those baser instincts, there's some call to action in service of higher goals and ideals than are normally presented to us. And many more public religions and myths tell the same stories with the same end goals, though they're often obscured by petty conflicts or the need to treat myth as literal, historical fact, thus obscuring the metaphoric meaning(s).
Now, I am a huge advocate of free thinking, so I don't necessarily think one Order or another has the best ideals by which to live. But I've also heard other free thinkers disparage such traditions, because they espouse a particular set of standardized values. Or because - as with the Masons - they keep things secretive. I'm not as hard on them on either count, because I can see the aim as being noble, and I think that contemplation of living by a set of noble ideals - whatever form they may take for you - can be a valuable practice that can not only benefit the world around us but, importantly, the individual as well.