Choosing the shortest path

When I explain the importance of the "go and see" principle in lean training, most of the participants nod in agreement about its use. Many participants understand that no matter how much documentation (instructions, manuals) is available at the point where the task is being performed, people will figure out a different way to do the task.
Why?
Because most human beings will find the most convenient way of doing work. This is "their" way and may be the shortest path of doing the job.

That is why it is important to go and see what's happening in the process. In order to improve a process, we must know how is work being done everyday by direct observation.

Though most lean implementers realize the benefit of the go and see principle, I have seen very few actually practicing it.
Many lean implementers I have talked with say...
- we don't have time to stand around and watch people what they are doing
- our folks follow what is written on the instruction sheet
- it is time consuming and boring to watch people do the same task over and over again

In theory most lean implementers realize the benefit of using go and see principle.
However, applying this principle in practice is another story.

Have you used the "go and see" principle in your lean journey?
Would you like to share a story or an experience about the use of "go and see" principle?