Wow, there seems to be heaps of hate and misinformation here about Linux.
I run Linux almost exclusively. The only app I lack under Windows is Cubase. I have a lot of history, investment and time/experience tied up in Cubase.
Photoshop? For what most of us do, GIMP is actually more than sufficient. I know many professional photographers who do the majority of their post processing in GIMP. I personally use Darktable (an Adobe Lightroom clone) as my only RAW image converter/processor. I also do video editing using OpenShot and 3D modelling/rendering (again for video) using Blender.
These are fantastic software packages, not half-arsed buggy 'compile from source', 'lib dependency hell' packages. Most software you could ever want is available in standard (or extended) repos. It just works.
As for drivers, I've not had any driver issues for years. This isn't even true of Windows, which still seems to require additional drivers for basic things like printers, some USB chipsets (USB3?), any even slightly unusual soundcards etc.
Window managers - how can choice be a bad thing? People love OSX because it's different. People also love KDE, Gnome, Xfce etc - different solutions for different people. Some like the window manager to hide in the background, others like gadgets and interactive toys to brighten up their desktop experience.
There seems to be a huge amount of hate for Unity but ... you know what? It's mostly just a launcher; It launches apps. I spend most of my time actually using applications - not bitching about the lack of some wizzy composite effect, or the fact I now have to right click whereas before I could left click.
Check out these packages, then their windows (or OSX) equivalents (and their costs) and you may find yourself reconsidering Linux.
Darktable:
http://www.darktable.org/ (Canon/Nikon/Pentax/Sony etc RAW editor)
OpenShot:
http://www.openshotvideo.com/Blender:
http://www.blender.org/GIMP:
http://www.gimp.org/Libre Office:
http://www.libreoffice.org/Linux *is* now a mature OS with mature applications. Your decade (or more) worth of Windows experience may not be easily transferable, but then this would be equally true if you moved to OSX (which is also rock solid with superb applications), or any other desktop OS.
It's sad that I feel the need to defend Linux on an Amiga forum. You guys are dismissing a whole world of quality free software - you're seriously missing out.
Seriously, I can't give enough thanks to the developers of Darktable, Openshot, Blender and GIMP plus Linux / OSS in general. Having such amazing software available for free is just incredible.