One of the better comparisons of Mac OS X to Windows I've read
For Mac OS X, it's the classic English butler. This OS is designed to make the times you have to interact with it as quick and efficient as possible. It expects that things will work correctly, and therefore sees no reason to bother you with correct operation confirmations. If you plug in a mouse, there's not going to be any messages to tell you "that mouse you plugged in is now working." It's assumed you'll know that because you'll be able to instantly use the mouse...
Windows is...well, Windows is very eager to tell you what's going on. Constantly. Plug something in, and you get a message. Unplug something and you get a message. If you're on a network that's having problems staying up, you'll get tons of messages telling you this. It's rather like dealing with an overexcited Boy Scout...who has a lifetime supply of chocolate-covered espresso beans...
To put it simply, you can work on a Mac for hours, days even, and only minimally need to directly use the OS. With Vista? The OS demands your attention, constantly.
From Information Week