I use Windows, Mac and Linux and Macs are indeed nice but each is a different experience. This is all opinion but ... Macs have a more integrated feel to them. It's almost like buying an appliance. You don't hack your appliances. You turn them on and they go. Windows is kind of somewhere in the middle trying to be more integrated in the way it does things but still accessible and then Linux, despite great advances in usability, still feels like a tinkerer's delight.
In any case, you'll need some ramp up time to get used to a Mac and hardware tends to be pricier as well. Don't forget to consider that you'll need to replace any software you now have on a Windows PC with versions that will work on a Mac. You may also have to deal with compatability issues with files being moved between Mac and Windows although this isn't the problem it once was.
I'm not trying to discourage anyone from Macs, btw, just pointing out some stuff that isn't always obvious to folks when they start talking about a major switch...
Regards,
Robert