These links look like you just googled "windows thrashing" and copied the first 4 results. Did you do that?
Addressing your links in order:
1. I know that the word is thrashing, I was quoting the OP.
2. The existence of someone who thinks they experienced thrashing (but didn't do any investigation to see if they were actually experiencing thrashing), 13 years ago, doesn't seem very difinotive to me.
3. Please read this page. You'll see that the first sentence is "hard drive is being continuously thrashed even when no applications are apparently running". How is the system thrashing when there are no applications running? FYI, "thrashing" does not just mean ANY frequent hard drive reads for any reason.
4. I don't know what this article has to do with the question I asked. The article title is "How do I tell if my Windows server is swapping?" which seems completely unrelated to my question about how often Windows swaps?
Famous, huh? Do you have any resources or articles where I can read about this famous phenomenon?