I know that after a few months of toying with arc, the prefix notation seems to be clearer to my mind than similar code in infix (I still code in ruby at work), but finding anything concrete on the net about the effect of coding in prefix is tricky. I mainly run into blog-posts expressing a similar feeling.
http://en.wikipedia.org/wiki/Sapir-Whorf_hypothesis
http://www.frozenreality.co.uk/comic/bunny/index.php?id=919