A while back I expressed a viewpoint similar to what
@coffeefan is saying and you said some similar things in support of Grizzly Peak. I also want theme park lands to be transportive and yet I also agree the ingredients of achieving transportive-ness are not always obvious. It's true that how far-out a theme is in time or place in and of itself does not mean it will be more successful.
I like the vibe of Grizzly Peak. I think my two minor complaints would be, first, that I wish it had a bit more "awe" and natural "wonder" and feeling of adventure/slight peril; and second, was a bit more transportive in terms of time-setting. I know there's a couple of older vehicles, and I love that. I wish there was more done to fuel that aspect of transportiveness.
As for the implied era, I grew up in So. Cal. in the early 70s going to Yosemite, Big Bear, Sequoia, etc. I hate to admit I experienced some of those places while in a Boy Scouts-like YMCA organization called "Indian Guides" in which we wore Native American attire and basically engaged in ignorant, regrettable cultural appropriation. (The organization has since been rebranded "Aventure Guides"). But those places and that era are close to my heart.
As for awe and wonder and a bit of peril, one thing I did closer to being an adult was go to Moaning Caverns, and wow, that was cool. I think there are other caves in the area. I wish they'd build a spelunking walk-through attraction in GP in which you get into a rickety elevator that simulates going deep underground (a little like the Haunted Mansion) but doesn't go down at all, then you get out and can explore eerie, mysterious caverns with waterfalls, bridges, tunnels, etc. (which would all just be inside a moderate size show building). So kind of a Tom Sawyer Island/Redwood Creek Challenge Trail but indoors and with a fantasy/transportive-layer that you're deep underground. That kind of thing to me would take a theme like Grizzly Peak which is cool, and a great vibe, relaxing, and add a bit more of that fantastical Disney theme park magic.