I have nothing against multi-tasking, but I couldn't have all of those Windows open at once. I have a friend who I used to work with that has ADHD and OCD (I'm serious). He would literally have his whole desktop covered with icons (the ADHD side), but didn't want to get rid of any, in case he would someday need them (the OCD side). He lives the rest of his life that way, and has at least 3 storage lockers that he rents, his house is overflowing with everything imaginable, and 7 vehicles crammed with "stuff" that he can't decide to get rid of. To top it off, he's a doctor (and a very good one, despite these problems).
I leave things running until performance slows down, then I get medieval and close everything. Performance is not really an issue on the desktop anymore, since I added a half-gig stick about three weeks ago. Windows really starves and thirsts for memory.
So bad, in fact, that I've broken down and ordered an upgrade for my laptop...the little thinkpad that could.