I log everything at work since we have duty time limits and what not. If the Hobbs is moving for us to fly, it's being logged. If we start up and taxi out to do a run post maintenace or something, I don't log that. I had no intention of flying. If we decided to go fly, then sure.

On the private side, if I logged every time my plane's Hobbs ticked over .1 going to/from the fuel pumps, hangar, etc. I'd probably be mad with adding up my logbook by now.