I wonder how much geography changes this, if turning right all the time (sorry, I'm in civilisation where they drive on the wrong side), would result in doing more hills say?
My biggest screw up in routing is discovering that I'm on the wrong side of the canal to where I want to be, and I have to do upto a 1km detour to a bridge to get the 10m I need to my destination. (It's really annoying when geocaching).
I think that the US grid layout style cities may be more beneficial of this style of routing than cities like Ankh Morpoch^W^W London, or Paris, or Amsterdam. As for Brussels, just abandon all hope those who go there...
Incidentally since being in Amsterdam I have realised that the only sensible directions are Hubwards (towards central station), rimwards (towards the A10), turnwise, and widershins. Trying to do Noord, Zuid, Oost or West just gets confusing... Hanging out with geeks this system has been adopted by friends surprisingly fast...
J