Got this from informationweek.com ... quite an old article but very funny ...

"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 aren't 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. Plug in a USB or FireWire hard drive and the disk showing up on your desktop is all the information you need to see that the drive has correctly mounted. It is normally only when things are not working right that you see messages from Mac OS X.

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. This gets particularly bad when you factor in things like the user-level implementation of Microsoft (NSDQ: MSFT)'s new security features.

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."