Im almost at 2 years owning a Mac (for the first time)
Here are some reasons why I prefer Macs
-Stable - I feel confident my Mac will run smooth without any conflicts or demanding my attention to press some freakin button which takes me to
-Im Driving - Using a Mac Im in control, with Windows the user is bombarded by unintuitive "glitter". The glitter is all the things fighting for your attention like Las Vegas. A Mac is lean, intuitive and powerful
*Also to install software you drag the icon to the Applications folder...to unistall, drag to trash/delete...gone

*Spaces, Expose, Widgets (whole translucent screen that appears/disappears with one key stroke) these are Mac things I could NEVER EVER live without again!!
-Less=More - With less hardware power I have more speed...how can that be? Its because the OS is efficient, running with ONLY the drivers I need and optimized to work with them. The OS is written with this wide view goal in mind...as a system. My Mac feels smooooth

No AV no spyware checker, no slow downs
-OS add-ons - OSX comes with Imovie, Ical, Dictionary, Itunes, Disk Utility, Address Book, Iphoto, Photo Capture, Front Row, Mail, Quicktime, Preview and these are just the ones I use and from memory...
Windows comes with "Join AOL" or "Norton" or "Warning your computer may be at risk" BOING "Sign up now for a free trial
If I want the preferences of almost any software I know I can press the COMMAND + , and be right at it, or COMMAND + Q to quit/close the application or several other across-the-board shortcut key commands.
I feel safe checking my online bank account (this may be psychological) shopping online or having privileged information on this computer. I may not be better protected, but I fell I am and thats important to me.
Last but not least I love my Mac. It feels like an extension of me when I use it. Its intuitive, well thought out and easy to use. I definitely have a connection with it.
Windows raises my blood pressure. I tried to like W7 but it feels like more of the same old thing in a different package. Sure it may have had this and that redone, but its still a pain to configure and use and nothing about it feels smooth.