There are pros and cons to moving to a Mac.
On the positive side the big thing is that there aren't viruses for Macs. You don't have to worry about anti-virus software clogging up your machine. They're also generally very easy to use and things feel a lot "prettier" and nicer than Windows. My Mac is a pleasure to do things on, my Windows machines are somewhat clunky tools.
Everything works really well together on a Mac. Your music and photos are all looked after and it all feels nicely integrated together.
However there are downsides. The biggest one is if you're a gamer, not Flash we'll come to that in a moment. There are some games for Macs but the selection is really rather pathetic. In general you'll also find that there's less software out there. Yes you can put Windows on your Mac, but that's extra expense, and half the point of having a Mac is moving away from Windows.
Macs also aren't very customisable in terms of hardware. Most desktop PCs can be taken to bits and have extra things such as new graphics cards and sound things added. With Macs it's not so easy, you tend to stick with what you've got.
Macs also aren't very customisable in terms of software either. I've got all sorts of things running on my Windows PCs and I hack them about all over the place. As with hardware when it comes to the Macs software it's pretty much as it came.
Macs do have a Flash player so you can keep on playing Farmville and Stick War, don't worry about that.
Definitely take one for a test drive though, some people just really don't get on with them.
In the end to me my home machine is something that I don't want to have to worry about, want to enjoy to use and I don't want to have to worry about viruses. I want it to "just work" and I'm not a big gamer.
So for me a Mac for a home machine was an ideal choice and I can't ever see me buying my own Windows machine again.
That said I couldn't imagine doing my job on my Mac, Windows while clunky and awkward is incredibly powerful and flexible.
Horses for courses...