I work on Google Maps and can confirm that it definitely takes the time required to turn left vs. right into account. If you send me an example of a bad route (

I work on Google Maps and can confirm that it definitely takes the time required to turn left vs. right into account. If you send me an example of a bad route (you can use the web interface, which uses the same backend as Google Maps on your phone) I can take a look as to why it's routing you the way it is. My email address is in my profile.