It was a fascinating idea - programs were hidden behind a document template metaphor. It was not as neat as Windows “New” menu and its templates folder.
> document template metaphor
The macOS Finder has its own version of the Lisa's stationery feature:
File > Get Info > Stationery Pad
To make a document template folder, you mark your document templates as stationery. Then drag the template folder to the dock to get a pop-up template menu (or multiple menus if you wish).Also kind of makes sense out of the concept of "Desk Accessories" (i.e. the things under the Apple menu in Macintosh System 1 — Lisa OS also had these.) Every Lisa OS "task" (there were no processes in the pre-emptive sense) is either running a program in the context of a document that program manipulates; or is a document-less accessory program, running under some other task.
This was the original desktop metaphor, from Xerox. I think it's pretty charming and enjoy playing around with it, but I can imagine getting real work™ done on it would get annoying quickly