As someone who works in a warehouse, I can tell you those aisles are not overly narrow. It all depends on how your forklifts navigate. Ours use a wire guided system that keeps them on an incredibly straight line and allow the aisles to be about 8 feet (I think less?) apart.
Also, the shelves are not necessarily overloaded if the racking is appropriately installed and maintained.
Most likely this warehouse is not built to code or exists somewhere that lacks appropriate building codes and safety feature.
