Even if you use this redundant `let` form you can still make it more readable by doing the following:

    (let ([hello-func (lambda ()
		        (displayln "Hello world!"))])
      (hello-func))

This applies globally; when it makes sense, differentiate between some lists by using brackets instead of parens. Some Lisps take this further by using other bracket types to signify certain things.

I would advise not to hop on Wikipedia and assume things about languages. Scheme is not very hard to get into and with variants where batteries included you can build useful stuff right out of the box.

Go to http://www.racket-lang.org/ if you want to see a good example of a pragmatic and useful Scheme variant that may just dispel some of your prejudices.