The B737 Elevator (and ailerons) are connected with cables to the control column. With no hyd power they will droop an inch or so until the stops in the PCU are contacted. They will then stop unless wind pushes them around.
Nearly every other airliner has fully powered controls. These will droop right down under gravity as the hyd pressure dissapates, this may take an hour or two, or with a small leak in the PCU will take a few minutes.
The B737 is showing its connection to its grandfather, with steel cables and manual reversion.