It should be possible to add tags to workflows to organize them properly if very many exist.
I suggest in “save as” section should be directories as a projects name that there are some workflows in it.
My Project 1:
- workflow 1
- workflow 2
My Project 2:
- workflow 3
- workflow 4
- workflow 5
Personally not a big fan of directories. It is just possible to add something to one directory but if needed always multiple tags can be added.
Display wise it could still be similar like what you described above.