Well, a reorganisation to a structure that you are going to stick to cant hurt, as the set has grown explosively in the last year or so.
I am just not sure if this should be done at GRF-level or at Purchasemenu-level...
If you are going for GRF-level, then choose the names of the GRFs wisely. Make sure they are clear about what is in them and think about what you are going to do if one of them is full and you have to continue in another GRF.
Personally, I would first go for a reorganisation at Purchasemenu-level.
First, you dont have to worry about the GRF-names too much (You could split up in 3 main GRFs, for example, Auz-passengerstations Part 1-2-3-etc, Auz-freightstations Part 1-2-3-etc and Auz-waypoints Part 1-2-3-etc).
Then you can go for a much more detailed Purchasemenu-structure, for example starting off with making separate structures for your platform-types, example:
- City Bitumen, normal platforms
- City Bitumen, single-sided
- City Bitumen, Island platforms
- City Bitumen, overlapping platforms (those for getting switches inside stations)
- City Bitumen, etc
- Suburban, normal platforms
- Suburban, single sided
Etc Etc Etc for the other platformtypes
Then add non-track stationbuildings
Then add non-track tiles (maybe split those up, depending on if you already can see certain groups/types within those)
Then add non-track overlaps
Finally you could add other things that might not fit into the above categories (also in the future for new ideas), like cargo-aware things.
You may then end up with a long list in the purchasemenu, but I think that a player then can find things easier and you can add new things easier (and place/add them in their categories easier).
But this is my personal view, I like having a large purchasemenu structure, where certain types/groups of things all have their own menu, others may certainly disagree
Also I think that you will eventually end up with a rather large menu-structure anyway, so splitting it up first in GRFs that may not be filled or can get confusing when they do get filled, isnt that great of an advantage/improvement...
In short, I think a well structured purchasemenu is more important, think/discuss about that first. Then you can choose if you want to put some of those into separate GRFs.