What are you basing that claim on, just your own personal experience? It's a pretty extraordinarily claim to say that linux on the desktop requires no configuration, and I think such a claim deserves at least a little bit of evidence above and beyond your own personal experience.
As a counter example to your claim, I just finished installing Ubuntu 10.10 on an Asus EeePC 1015. In the process I ran into the following issues: 1) Wireless doesn't work without additional drivers 2) Multitouch input doesn't work 3) Samba sharing with a windows pc doesn't work. The Asus EeePC isn't exactly an exotic piece of hardware, so it's difficult for me to comprehend why ubuntu can't get wireless working, let alone the other issues. Rewind back to Ubuntu 10.04, and in the default install, X won't even start.
"In Linux, all drivers come bundled with the operating system. On Windows or a Mac you have to install them yourself." In my experience the complete opposite is true. When installing linux I have to go download my wireless drivers using a wired connection, same goes for my printer. On a fresh install of windows 7 (from a RTM version - i.e. not what the manufacturer includes on the machine) everything works "out of the box", including wireless, the touchpad, and my wireless printer.
Now I'm not disputing the fact that linux has made significant gains in usability over the past 17 years, but I will strongly dispute the claim that everything generally works without additional tinkering and configuration.