I'm saying that GR and QM apply to all things, not that the brain "isn't quantum". It follows QM rules in the ordinary sense that electrons orbit atoms in the brain the same way as they do in other well established contexts. Similarly, the many-world interpretation is that the non-locality experiments make perfect sense if you include the human brain in the experiment and stop excluding it. That's simply a statement that we are not "gods", somehow standing apart from the Universe and observing it from the outside. We're in it, and interacting with it, the same as everything else.

The only really interesting QM "stuff" that seems to be going on is that some enzymes have incredibly high efficiencies, even when bathed in dilute reactants. There are hints that this may be some sort of inherently quantum mechanical process that cannot be understood classically. But this is a tenuous hypothesis at best, there's no hard evidence yet, let alone a good theory.