It will probably be a pretty physical experience for people to get the most out of the narrative and you have to be on your toes and fit to keep up; following performers is only necessary if you want to have a narrative throughline though (it's also the most emotional way of experiencing it), otherwise you have the fragmentary dreamlike experience you allude to (which is fine). You can play the game differently, wandering around steadily in the space, but that's more for people interested in design.
Crash of the Elysium was a kid's show really, like a nice, not very scary, theme ride (with added Matt Smith), a few things stayed with me but it was really quite simplistic. It Felt Like a Kiss, the collaboration with Adam Curtis in Manchester a few years ago, was stronger but not particularly subtle. Their best linear show, in my opinion, was the most recent, 'The Borough' based on the same poem as Britten's opera 'Peter Grimes', an audio tour with unexpected performances as part of it. The script (by Jack Thorne) had all sorts of different levels which provided that extra richness.
I prefer the ludic/gameplay nature of their biggest shows personally, the more challenging to decode the better (lots more people like that via the above link). It's also a challenge to the FOMO (fear of missing out, that is), as you can't see or get everything; wondering if you should be somewhere else, or where someone else is. You aren't supposed to communicate, use phones etc for that reason. Sadly, I've seen at least one person desperately trying to text someone else because they got split up; theyre just doomed to failure I'm afraid.
Proper spoilers below, so even though this is a spoiler thread don't look if you don't want to know -
Which Edinburgh experiences have you done? You Once Said Yes was/is great although What Remains by Grid Iron was sadly undeveloped. I'm off to Edinburgh in a few days and the best new immersive show there is Our Glass House which is in London in November (booking via Camden People's Theatre).