I remember when I was a child, I would wake up very excited the day when my favorite soccer club was due to play. I would wait in anticipation of the game throughout the day, and the feeling of anticipation was often as great, if not greater, than the feeling of watching the game in the evening.
The same is true for many events that you anticipate, both personally and professionally. The feeling of anticipation is greater than the feeling you get when the event actually takes place.
The feeling of anticipation may have evolved in this way so that we don’t lose sight of our targets. Without it, we might otherwise stop pursuing some long term targets that actually provide us with an evolutionary edge.
Similarly to the feeling of anticipation of a target often being stronger than the feeling of actually experiencing the target, the journey is often more rewarding than the destination.