The problem is that not everyone is you. At a former job I supported PCs and then the director of marketing decided that he liked Macs so he unilaterally switched his group to Macs. Anecdotally I'd say the users had just as many problems that needed my help as they did when they were on PCs, and in addition had additional problems they needed sorting out in the first couple of weeks following the switchover due to their lack of familiarity with OSX. Most of their day to day problems were software related, so the underlying OS didn't factor into that one way or the other, and these peoples' self troubleshooting skills were practically nonexistent so it meant just as much work for me, and in some cases more as I was also then tasked to find them alternate software to do a given task.
For the average users, once you get past the enthusiasts skewing the numbers the IT savings will probably not be as significant as this article makes them out to be. People are still going to be having trouble mapping a drive, sharing a folder, logging into an SFTP site on Windows or OSX.
Hardware wise, the Macs generally use decent hardware that lasts, but also charge a premium for that. If offices used PCs that weren't the cheapest thing that fell off the turnip truck they'd see as good or better failure rates than the Macs. And Apple hasn't been 100% immune to shitty hardware slipping out the door so spending more on the Mac isn't a bulletproof guarantee either.