How do I pan in EagleCAD with an Apple MagicMouse
You need a mouse with a standard no-frills middle click button for Eagle. The center click on my Thinkpad doesn't work either because it uses some nonstandard scroll thing with the Synaptic driver where it's treated like scrolling on the touchpad instead of a true third mouse button.

You might want to give Kicad a shot instead, it lacks a normal middle mouse pan function in favor of more zooming in and out that normally bugs me, but it could work out to be more intuitive with the MagicMouse -- the nonstandard middle mouse on my Thinkpad ends up working as a pan+zoom function.