The monad pattern is everywhere, most languages just don't explicitly recognize it. Any non-trivial program will include many different monads; they just won't be recognized as such in most languages.

For instance in C#, there is a monad with bind=?? and return=no-op (similar in use to the Maybe monad in Haskell). There's another monad with bind=; and return=no-op (similar in use to the IO monad in Haskell). C# just doesn't explicitly recognize those as monads.