Maybe my interiors have/don`t different issues (despite the dogs) or perhaps I just go about it differently. Guess I`ll back off my position (except where the vents/ducts are concerned).
David Fermani- I suspect that you and I might define "dirt" diffferently

Dust and dog hair are primarily what I deal with, and both can sure blow around, easily getting into places where they`ll cause me *more* work.
David & RaskyR1- Yeah, I was ASSuming that the stuff`d get blown into something like a damp MF whenever possible, or that other measures would be taken to trap the blown-off stuff as best as possible, but I can imagine lots of areas where that wouldn`t be feasible.
Maybe I`m actually *trying* to find reasons to disparage the idea, based on the vent/duct thing! Hmmmm....
So, eh, OK...I can see a greater benefit to it than I did at first (or third) blush, but still only in certain circumstances. Gonna be all open-minded about it and try doing it more often than I had (which sure wasn`t much) and see what I think. When both you guys think I`m missing something I`m not gonna ignore you.