Gotcha, @jea48 . That definitely clears it up for me now. I did not know what an 'isolated ground' was before, and now I do.
None of the duplexes I installed in the circuits I installed for my system are IGs, and on the existing circuits in my home that I have worked on before, I do not remember seeing any insulated equipment ground wires, nor do I remember seeing any insulated ground wires connected to the neutral bar behind my panel, except for the insulated white wires.
That typed, one of my many flaws is that I have tunnel vision and if I am not specifically looking for something I do not see it or I often forget what I saw assuming that I did see it.
This is interesting though, because back in the '90s I bought a DIY home wiring book at Lowes, and a few years ago when I was installing some more dedicated circuits I referred to it to see what I needed to do behind the panel, and the pictures were actually showing insulated (green) equipment ground wires coming back to the neutral bar behind the panel. Now I have to assume that the pictures were of an IG?
Anyway, TMI, but I didn't feel comfortable working behind my panel using what that book was showing me, so I watched a few youtubes of people putting new circuits in and used those as my reference.