15 minutes to unbox probably doesn't include taking out the trash. :)
I'm a power user, so I need a lot of programs and setting them up properly usually takes 4-6 hours if not more. Just finding and installing proper driver for stuff like my Wacom tablet takes 30 minutes or so. Again, if you do this every day, then yes, it could be much faster. But I buy a new computer once in 4-5 years and really cannot bother to automate.
Last two times I got a new computer, it took me 2-3 days before I could work on them at full speed. It sure is worth more than $550. Not calculating the cost of stress if something does not work properly.
I have been using Linux for 7+ years and Mac for just over one year. The difference: Mac is mostly Plug and Play. Linux is often Plug and Pray. Hell, doing something simple like copy/paste on Linux still feels like a game of chance.
I love open-source and freedom, but as I got kids I became more pragmatic. The time is limited and I'd rather spend it on building stuff than figuring out some quirks in the operating system.