The Enterprise was not docked to the space station....
They made a big point of us (the audience) seeing the great beauty shot of Enterprise. I absolutely LOVED that scene...very emotional and great music. But it was just floating there in space. Why did they act like they had to go thru the details of casting off mooring lines and impulse power, etc? It wasn't connected to the big space station like we saw some of the other ships.
Captain Kirk to the Enterprise in "The Naked Time":
"I'll never lose you!"