Apple has the worlds most terrible mouse product designs, but if there is one thing they got right it was the touchpads. I will not be purchasing a Windows laptop until I can get one with the exact same touchpad with the exact same surface and feeling to it. I've spent countless hours with my Mac and just the touchpad, I wouldn't even dream of doing the same with my Lenovo IdeaPad or any other laptop I have played with to date.
The input lag is one thing. What about the actual hardware? Remember the hockey puck? The pro mouse? The mighty mouse?
There is a joke somewhere in there... maybe about Jobs having to "invent" multi-touch because he couldn't grock the concept of a mouse.