I switched from a Wang PC running Windows 3.1 to a Performa 630 running Mac OS 7 back in 1995 and I haven't looked back since. Yeah the US government bought millions of Wangs just before the company Wang went out of business. My tax dollars at work.
Since 1995 I've used: a Mac IIe, Performas, Quardas (68030 Processors), Power PCs with the 601 to 603e processors, the mac Clones (Starmax, Power Computer, and Umax), the original Bondi Blue Tead Drop iMac with the G3/233 Mhz Processor, to the towers, to my current system which is a Intel Core 2 Duo iMac 1.83 Ghz, and I just purchased a new 2.4Ghz iMac earlier today. My 1.83Ghz iMac will be going to my parents to replace their G4 eMac.
As for laptops, I have a G3/400 Mhz "Pizmo" powerbook, which I bought in 1998 and still use today for recording TV using Elgato's Eye TV device. I also have a 2.0 Ghz MacBook which I use for travel, and a PowerBook 520 (monochrome) which has sentimental value.
Now I've also purchased Windows machines from Gateway, Dell, Toshiba, HP, IBM and Sony, for my company and I'm familiar with troubleshooting stuff on Windows 95, 98, NT & XP.
If I want to work myself I use a Mac, but if I want people to think of me as "useful" I get them a Windows machine, as the amount of stupid problems I receive about windows keeps me employed...