If this were the case, that "writing code is the easy bit", re-writing VFP application that has been working for years and therefore already past the state of "understanding the nature of the business" to .NET would be "easy." Maybe it is/was for you but you can't say it is the same for everybody.

You are correct. I have the gift of being a quick study. I got straight A's all the way through high school and 3 college degrees with very little effort.