When I logged into Farmville today I saw this:
For me, it doesn't really matter if my farmer walks fast or not. Because she is not going to walk anywhere on my farm!
After I got the Fence award, there is simply no space to leave the fence lying around, I need to fence up all my crops and animals. Yes, even the poor kittens!
There is one advantage though, the farmer works faster without walking :)
Fence up everything and you get things done faster