Love this question, and it's something I've pondered a lot, as well.
After a few years of doing this, I have collected several racks worth of modules (my racks are public, "A. Setup Winter 24" is the current configuration, and "A. Unexpected Bounty" is where I plan to go with it). I've tried a number of different ways of interacting with the system, but I've learned that my mental workflow is most efficient when I group modules by function. I also go left to right and top to bottom, for the most part, but I've started to think more carefully about ergonomics and playability, and because of that, I've started move modules out slightly differently and add spaces between them for bettwe access. I've also had to adjust for the realities of multiple racks in a small room and long patchcords to connect them.
For my planned final case (A. Unexpected Bounty...), in my topleft case I'll have clocking modules, then my randomness generators, lfos, sample+hold, and envelope generators and generally my cv creators/manipulators. Top middle cases are voices and filters and drums. Top right are predominantly effects. Bottom racks are reserved for modules that are more playable and interactable. Bottom left is CV mixing, blending, futzing, and quantizing. Bottom middle is predominantly playable modules and the final mixer. That's my general plan, which I then adapt based on logistics and space. Finally, I like to pepper specific utiltities about (a mult here, s+h there, some lfo's or random about), so that I have those accessable throughout the system.
For me my system is just as my mind, chaotic. I work with an erica megarack in my "studio" and a 2X80HP portable batery powered case for working outside (where I get most of my inspiration). Modules go in and out of the rack and the case and never have a permanent place in both of my cases. This way I invite my self to experiment, puzzle and avoid patching routines.
-- Niemandsland
I've heard other people say similar, but I think I'm too attention deficit to handle such chaos and be efficient. That said, I can easily see how it leads to deeper experimentation. On another note, I'd love to hear more about this battery powered rack. Did you DIY this?