I coined the phrase Kindergarten Walk several years ago after realizing that I couldn't go straight to the platform at LAX to board the SWC back to Albuquerque. Perhaps I could have. When I arrived in the concourse at LAX, I proceeded to the tunnel where there was an Amtrak station agent at a podium. I asked where my train was, and she directed me to sit and wait until called.
This was a new experience for me as I grew up in Japan where the platforms are gated and everyone is expected to know where to go. There are plenty of employees and sign boards available to help one find not only the right platform, but where to line up for the door of the car that you are going to board (which open pneumatically as opposed to manually).
I tend to be a person who likes to operate autonomously. I'll take my bags to the platform, wait for the train to arrive and board. The concept of having to wait for someone to call and then usher 100 passengers in a walk to the platform was foreign to me. I still don't think it's completely necessary. Did the legacy railroads have a Kindergarten Walk?
Back to being off-topic: I believe that the Acela is poorly designed for seating management. All the seats should swivel, and they should be rotated at the end of each run. There should be no tables as these have shown to be deadly in crashes (ie: the Bombardier Bi-Levels on Metrolink). Tray tables should be designed to be sufficient. The fact that a train makes multiple stops should have no bearing on the capability of operating an efficient algorythm for seat assignment. Again - this is Standard Ops in other countries. I would hope that Acela II can be built with scalable train lengths, a combination of reserved seating, first class, and unreserved seating.