Is there more to writing well than just stringing together a whole slew of random words all willy-nilly?

There is no room for nilly willy in constructing beautiful sentences.

One must elucidate, not obfuscate when composing, as haphazard or perfunctory writing precipites ennui.

For example: "That cat there be cute, he is" are random words strung together.  To enhance these words, one must make them "flow".  While one may write, "Isn't he just the cutest kitty you ever saw?", it is more elciudating to write, " The masculine feline is aesthetically satisfying".  Not only is it more elucidating, but it demonstrates your imposing writing prowess as well.  

Indubitably 

probably