In my experience they are because you don't need to load many drivers.
You have to load just as many drivers on a Mac as on a PC. Each bit of hardware needs a driver to interface with the OS; there's no magic about a Mac that means it doesn't need drivers for hardware.
But it's true that on a Mac you have a very limited choice of hardware, basically what Apple will allow you to have, and hence a very limited set of drivers to choose from. Again, it's all a matter of what you want. If you want a fairly fixed system then a Mac is a fine (if rather expensive) choice. If you want to be able to upgrade, for example, a graphics card to one of your choice then a PC is a better choice.
I suspect the difficulty of upgrading Macs explains why so many people tend to get excited when a new product line comes out from them. If I need a bit more power from my PC I just buy a new graphics card, a new processor, whatever. It's a continuouis process; I don't need to buy a whole new PC every year or so.
Macs and PCs are both fine choices - horses for courses. But the OP's motives for considering a Mac don't hold water.