Even if you're just browsing the net:

no fukkin popups every 5 seconds
no viruses
your computer wont reboot in the middle of an NFL 2h betting spree because Bill Gates decided updating Minesweeper was more important

Microsoft getting killed by Apple because they haven't figured out in over 20 years that the computer is your bitch and not the other way around

How many people can say their PC is running as smoothly as day 1 after 4 years? Mac users can