The standard thing most people will say about a Mac is "there isn't as much software for it as for PCs". Well, after going through a switch myself, and recently convincing my wife through months of her witnessing how much easier it was for me to get things done to switch from her Windows PC I've come to some answers for those who would say there is not software for the Mac: The bazillions of software titles out there for Windows PC's are about 95% CRAP.
If you go to your local Best Buy, Circuit City, CompUSA or wherever you will see aisles and aisles of software for the PC. If they even have a section for the Mac it will be about 8x6' of wall devoted to Mac software, if that. But when you look closer at what is available for PC's vs. what's available for the Mac you will realize that most of what's available for the PC aside from the standard Office, Photoshop etc. is just crappy software. That's because Windows is so entrenched that every software maker provides software for the PC, but there is so much that it is difficult to determine what is the best. On the Mac side of the software coin what is available is quality stuff that helps the user get things done. So really even though the software section for the Mac is smaller, it contains the software that has the most potential to get stuff done and all that other software out there only for PC's are primarily sold to make those software makers money. They don't necessarily make life easier for the buyer.
My wife switched because her Windows XP was getting too much in the way of what she does, which is create art digitally since I built her machine and installed Photoshop on it. As she got more frustrated we decided that a Mac would be the best way to let her get work done without the computer getting in the way of that. She uses a Wacom tablet and I told her that it would work perfectly with her Mac, the version of Photoshop would more closely follow the bible she was learning from, and the whole experience would be much better than that with the PC. I was a tad apprehensive about this since I've heard the stories of those who just couldn't cope with going from the Windows environment to the Mac environment and feared that my wife would be one of those but took the plunge anyway.
After replacing her huge, loud, power-hungry PC with her Mac Mini, plugging in all her peripherals (Wacom, keyboard/mouse, monitor, printer), copying her data files from the old PC to the Mac, and going through the initial setup I was prepared for long sessions on showing her all of the nuances of working with a Mac instead of a PC. What actually happened was I showed her precisely four things: What the dock was, how to navigate around in Finder a bit, how to launch iChat so she could communicate with me at work, and the notion that certain apps like Photoshop under the OS X environment act a little differently from Windows. She then proceeded to go off and explore her new computer with no advice from me whatsoever. She too finds it difficult to explain exactly why her whole experience is better than that with Windows, but words like 'intuitive', 'everything is so easy', 'spotlight is awesome', and 'dashboard and exposé make for such a cool experience' come to mind. She also really digs the built in dictionary. She is now more than happy to throw rocks at her old Windows PC, which by the way wasn't all that shabby of a computer.
So there you have an example of someone who isn't necessarily computer literate but is still familiar with how Windows does things finding that using OS X on a Mac is a far superior experience immediately after starting to use it. The only problem is that you have to experience it yourself before you can truly understand why, and even then it is difficult to put into words.