Mister X...
I was under the impression that merely turning the caching feature off on MediaPlayer just stopped the display, not the recording of cache. Wouldn't hurt to still check that MRU in regedit to confirm MP isn't still recording information...
I agree with your statement that most of the washers and such aren't doing anything that you can't do yourself... However, I strongly disagree with your statement that there isn't a use for them...
The ones that do provide wide use beyond the clearing history and cache include automation and secure deletion (and webmasters who are affiliates can get for free) like
http://www.evidence-eliminator.com/gold have a very important purpose. I can set it up and click a button and walk away. My time then better spent on something else.
Yes, they don't do anything a human couldn't do, they just do it faster. That's the whole point of having a program; they are just like Excell... You could do a spreadsheet manually, but why on earth would you want to when a much better option is available?