Another PC -> Mac convert. I used to hate Mac users, they were so smug. I now understand what they were smug about. Reasons for me to keep being a Mac user
1) security. Macs are just so much easier to maintain, without constant threats from malware, viruses etc. I've actually accidentally visited sites containing malware, and never had a problem.
2) ease of use - although some things I find annoying (I still use a PC at work, so remembering the different key combinations for MS Office is a pain when switching between the two), generally, Macs just get on and do things. Instead of the annoying paper clip, I think Macs work out what you want to do, send you off to go drink coffee while they sort it for you.
3)sorting things out when things go wrong - the resources online are pretty good, and so far, I haven't had a problem I couldn't solve using them. I even managed to add in more memory to my Mac - something a non-geek like me wouldn't have considered, but the instructions were very clear (and started with 'place a towel on the ground' so at my level ). I did have another FTer hold my hand through the operation!
4) aesthetically pleasing to use - so many of the basic programmes just seem a lot better than the MS equivalent. And now I have my first i-phone, phone and Mac fit together seemlessly!