OK, try this scenario on for size:
(forget for a minute that you're already a computer Guru )
You're 65 and getting cranky. Your ten year old PC just shot craps and you went out and spent nearly a thousand dollars on a whole new system. The high pressure salesman at Best Buy convinced you that you needed a new monitor and printer too.
So you get the new PC out of the box and all connected up and start through the half hour long installation procedure. After registering and making your own backup disks, (that's usually another hour or so) you finally get to settle down to actually running your new PC.
To see just what you've got, you open up Windows Explorer and click on "Documents and Settings" and you get a message telling you that you don't have permission to look at that. If you, the owner of the PC, doesn't have permission to look at it, who in heck does?
So this doesn't become a rant.....I rest my case!
If you like UAC and all those permissions, then by all means KEEP THEM!
For me and mine.....they're HISTORY!