My 1Ds III and 1D MK IV paid my mortgage and kept my kids happy in the fashion stakes so I have no complaints with the gear. However, after 3 years of abuse - the 1Ds needed updating and naturally the 5D III was the choice to select. When you have giant sausage fingers like mine - you have to use a grip otherwise you press 3 buttons at once - so my supplier ensured it came with the grip and the OP is right in the initial assessment - the joystick is in a dog awful low position - but also - 5 minutes using it you see why it has to be lower to fit the design of the 5D III and naturally - as in any profession - you adapt and move on to earn some dollars - a week on and it is second nature - the camera and grip feel very comfortable - so much so that my 1D IV now sits in the bag taking a well earned rest.
This is an example of good adaptability! What do you think of the 5D3 so far, having come from using the 1DS3 and 1D4?
They're, their, there, it's, its, too, to, than, then, you're, your. One lens, two lenses, the lens's aperture.