Excuse me LewisC.
The first result of that transportation wiz is that walking time is 13 minutes which is almost exactly what you say. There are alternate routes offered, but they are certainly not offered as the primary route.
Not sure what your issue is with that site, but it is a very nice tool, along with common sense and some basic navigational skills.
I can't say if it is perfect for all scenarios, but for me, it has been useful and has at least pointed me in the right direction.
Have a magical day.