The answer to this question varies enormously depending on the person...
I myself definitely do like acknowledgements and/or "thank-you"s... in part as confirmation that people received the email, and that my response was helpful (I do also often ask, as closing, "Is this addressing your question?")
Other people seem to have no interest in confirmation of emails, etc.
It only takes a few seconds to delete a "thank-you, yes, you answered my question" email. Even with hundreds a day, it's still just a few minutes.
So, if you have to guess, I'd think a brief, polite, "thank you" is optimal. For that matter, the people who'd object to polite intercourse will have other problems, anyway, ... so it may/will be difficult to placate them.
Even though things do change, I strongly tend to prefer confirmation, acknowledgement, thanks, and such stuff. (At the same time, I am well aware that the current U.S. education system generally does not provide good guidance on these things.)