This old subject popped up in my search.
I could add my new experience.
My Visio .vsd files opened tolerably in Libreoffice Draw. They contained a DXF picture and lots of extra Visio items drawn on top. DXF and Visio layering disappeared, but otherwise all elements were editable and page arrangement and paper sizes were correct. I have to think how I solve the matter of visible/hidden/printable layers, but otherwise I'll manage.
One more reason not to start my Windows box...