My needs for switching away from Window$ to Linux are as follows:
1. There needs to be a good video editor for Linux (one that is better than Cinelerra, here's hoping that Lightworks does the trick)
2. Better games support (Wine mostly does the trick, but it's not quite there yet)
3. Better multi-touch trackpad support. The main thing I miss about my old Mac is the ability to assign keyboard shortcuts to gestures.
4. Fix the power regression issue and add graphics switching support. I'm a laptop user, this is important.
I actually prefer the GIMP to Photoshop, but it's UI on non-Linux systems is abysmal, so I'm stuck with Photoshop for now. I'm disappointed by Unity and Gnome3, but LXDE has filled that hole rather nicely. Pretty much everything else about Linux I prefer to Windows/OSX, I just have certain needs that aren't being met.