My first reaction to this was that this was definitely less understandable, but I realized there were two pieces to this. One is banal - mapM_ and putStrLn are not near as simple as `for' and `print' (the latter have English meanings directly).

The second piece is interesting: Is something of the sort "<mapfn> <printfn> <list>" easier to explain to someone who's new to programming than "<foreach> <print>"? I've always thought the latter was easier to understand, but I'm curious which one someone who has no previous programming experience would grasp more immediately.