Go to any assembly line in the world today and you will find that there is a plan and purpose for every device and component assembled a purpose for every machine used to make the device or component. This method of assembly is based on a model of mass production, but it is also designed for consistency in the manufacture of products.
There is a similar cause and effect when it comes to web design. When you have a fully developed idea for what you need in your site design the more efficient the development process will be. Unlike an assembly line the site does not have to look the same as other sites, but it does need to bear resemblance to the most functional sites available. You will use tools to make sense of the design you create.
Web building software provides a perfect platform from which to take your ideas and forge them into something special. Web building software provides the templates while marketing support is structured to allow you to do more with web design with less cash involved in building the perfect website for your business.
Dont get me wrong a web designer can probably do the same thing, but the overall cost can be five to ten times...