During the process or journey the pleasure is anticipating the destination / end result that the work will create. At the destination, the pleasure is the journey it took / how hard you worked to build the thing / the knowledge that you did this. The more difficult it was, the more intense the pleasure. This is a remarkable cycle. It teaches you about life, which is the same cycle. The Kabbalists says that in the next world the tree and the fruit taste the same.