Maybe not putting safety cones but I recently saw 5 workers fixing some box looking component at a station. One was doing something to the box. One was holding down the 3 foot step ladder. One was shining a flashlight at the box and two others were standing behind the flashlight holder looking at the box. I wish I had taken a picture.
Obviously there's tons of waste, and maybe you were right about that example, but it's also very possible you're not. These anecdotes people love to trot out about manual labor are really silly. It makes you sound exactly like nontechnical software project management who don't understand what technical debt is or why man-hour estimation is hard.
These people are all needed. The person with the access rights is authorised to be on the system. The one taking notes is recording what's happened so we can write it up in a post-mortem. The others are watching and ensuring the person who's allowed access is doing the right thing.
If you walked past and saw it for 10 seconds you'd thing one person was working and three were standing around, but in reality they're all needed to ensure the right thing happens in the right way.
Were we guilty of the same thing as the construction workers in your example?
Your answer to that is going to sound quite similar to whatever response those workers might have. Put another way, unless you've actually worked as a subway maintenance worker, allow for the fact that there is a lot you don't know about the job.