But I do agree about the criticism of the moderators. I also think that there is almost a "Stanford Prison Experiment" level of power-wielding amongst some of the mods. There are examples of someone/me asking a question, and then someone closing it as a dupe, when in fact the question isn't a dupe. It might be superficially similar, but the mods don't take enough time to actually read the question and see if it's a dupe or not. And the rest of us are powerless to do anything about it.
But this is the minority of cases for me. For the most part, SO is a completely invaluable tool, and I love it immensely.
I think removing "Thanks" is a bit too abrasive. Maybe 10+ years ago, the NYC subway system tried getting ticketing agents to stop saying "Thanks" because they thought it would make things more efficient, and all it did was piss off the passengers. It's trivial, but there has to be a base level of civility between participants. I get that upvoting is "Thanks", but we're still humans (at this point), and trying to make communication more "efficient" by removing natural human responses makes it too terse, and almost insulting sometimes. It's a small thing, and I think it's better to just leave it in, because it's nice to say "thanks".