Years ago, when I worked in a PC only shop, people asked me what computer I used at home. I replied that I use a Mac. They were incredulous. When they asked why, I replied that when I go home, I didn't want to have to work. Based on this Quora reply, I'm not alone.
Answer by Ansel Halliburton:
I have built PCs and Linux boxes from parts. I built and ran a distributed Linux cluster. I had a few flavors of Linux on a laptop at a time when it was non-trivial to do that. I can handle running Linux just fine.
But now I choose not to. I have a Mac.
Why? I just don't have time for that stuff anymore. I am at a place in my life where I will gladly pay more money for a product of higher quality that saves me time because I am (1) really freaking busy and (2) not broke anymore. I need a low maintenance, high performance computing tool. Mac OS X and most of its major applications are well integrated, very high quality tools. Macs are also beautiful and shiny, and I like that as much as the next person, but it's secondary.
As for the question's premise that you can get as good a UI in Linux as you can on a Mac, that is just not true. Yes, there are some very shiny Linux distros and window managers out now. But the quality of third-party Linux applications' UIs is, generally, still poorâ€”certainly not on par with the average UI quality of Mac applications. You have to look at that when considering an OS because without third-party applications, the OS isn't going to get you very far.