Well, no harsh meant. i mean harm.
It's good to know someone else is willing to take that step into something totally new.
Just in case you dont know.

Mac runs OSX.
Parallels, Vmware, Bootcamp, these stuff, offers alternative above OSX.

Which means you can still run windows, linux, and all other OS while in the same time you can even run OSX.
The simplest idea is this,

when you want a window, you will get everything else but Mac, (of course there are exeptions like those Hackintosh)
when you want a mac, let's put it this way. you will get everything that you will ever need. and that's assuming you are not those hackers out there who configure their own OS.

and best of all, a new experience.

and i still run windows at some point just to use the softwares that mac is lacking, but that doesnt mean i can play hardcore games on it.
like those fps based games, you will usually give up playing once you tried it, it's just unplayable. Simple games like 2d and simple 3d games, may be. but that will depends on what machine you are choosing.