Yes, a good website design will consider the overall structure of the website, the ease of use for a user, the content positioning for maximum effect and many more factors. All of these factors play a role in a websites success. As an example, if a web page is cluttered and the user can’t find what they are looking for, they will leave. This results in a lost potential client and a bounce on your website statistics which is not good for your websites reputation on Google. You want each page to be clear and easy to follow, ensuring that the potential client finds what they are looking for. If so then you make a new client and if a goal conversion is achieved (such as filling out the enquiry form) then this will go in your favour as Google will know users are interacting with your website. This is one of many many factors but shows how a good website design can help improve your website from an SEO point of view as well as a users perspective.