I had no problems doing this in the US till on about the 20th day, on a lookout road above Denver CO, i realised I was on the left after 2 minutes driving along a windy road over blind crests..that was an awakening moment...
the real problem was making a turn into poorly defined areas like carparks with no lines...
And as someone else said, coming home was wierder, because suddenly my brain had no natural left right preference happening....several times i found myself confused in the first month back home for a second or two...
Yet flying i have absolutley no probs gooing left or right, other than the visual perspective from each seat is different.