After 22 years on Macintosh, I've completely transitioned to Crunchbang on a MacBook Pro and a Windows 7/Crunchbang dual-boot workstation. I really like the translucency and general look of Win7. I had started to feel like OS X was visually dated, but more importantly, harming my workflow.
For development and design, I am working nearly twice as fast in the OS using Crunchbang, and I've made it look and behave just the way I want it to. OS X is completely non-configurable! Since the only thing I need a consumer OS for at this point is for digital audio, I moved to Win7 as I wasn't about to lay out the $$ for the new, unfathomable, Mac Pro. What is that thing anyway? I worked with a guy in a metal shop to customize a case for my new workstation, tricked it out with an internal pro audio interface with exposed preamps and 1/4" jacks, and made it a 3U rack-mount. That versus a garbage can?
That being said, my 2007 Mac Pro is still ticking and I've been able to upgrade it considerably, though changing the processor was a PITA. It's still on 10.6.8- what I consider the high-water mark of OS X- but I would need Mavericks now, and that needs a 64-bit bootloader. (Couldn't use the hack for this since I have a flashed PC GPU in it and that precludes the hack.) Like I said, I can't fathom buying a new Mac Pro.
The way I see it, Apple is just for consumer devices now, and I love 'em. My iPad is critical to my workflow. OS X? Considered harmful. And visually dated!