I do not see where anyone said to install a ground probe without a GFCI. I think it stands to reason that we would all have GFCI breakers or outlets on our tanks. Basic safety should always be a consideration. I would never work on my tank in bare feet either. I also belong to the glove brigade.STOP telling people to install ground probes without GFCI outlets !!!!!!
It is also rarely discussed but every piece of equipment (including brand new) puts out a tiny amount of voltage. In my case, I replaced pumps that were faulty ... tested each and every piece by elimination and contacted manufacturers. I have that email confirming this from @Sicce someplace.
We can agree to disagree but the ground probe made a difference in my tank. I support responsible maintenance of our tanks and using ground probes.