They don't put busy cycles in the drivers for certain routines that tend to be used only by graphics apps so they can be faster for some stuff, but it's not like you HAVE to have a quadro or that geforce are so sketchy. If you read the Adobe stuff it was kinda misleading, ooooooh the gamer driver might not be reliable and ooo this, all nonsense, a good GeForce card did plenty of good (thankfully they made it so easy to hack them to work that you can scarcely call it a hack) an dnot everyone had the money to dump on a Quadro or wanted a Quadro and yet if you read the forums some got scared into it over nonsense.
Like I said, I have a Quadro 4000M but wanted to the 5010M, the difference in performance is huge (30% or so) and that is in real world usage and between two Quadro cards. I have also said that I have other laptops that have GeForce etc and there is a massive difference between them.
The top GeForce are great cards, but the Quadros are better for graphics, video, 3D, engineering software etc.
Same as a 5D Mark III is an excellent camera, one of the best on the market, but is it the best for sports photographers? Not by a long shot, but it is still a very, very good camera. That is the camera industry, why do you think the graphics card industry is any different?
I do not game so I cannot comment on that.
dirtcastle - I am sure there are plenty of benchmarks out there.