Sure, you can use other methods to update your site, but can they:

• provide automatic site management, keeping track of links, images, and other dependent files from a single template document?

• synchronize pages between your computer and your server? (DreamWeaver requires local files which provides you with a built-in backup)

• provides your site with visual consistant identity

• works with Contribute to provide lower level use for content changes by contributing staff without jeopardizing source code access; locking and protecting design integrity.

"By adding organization and structure to information, you can make the information digestable, understandable and familiar... By organizing the information, you've added value and meaning."
– Shayne Bowman & Chris Willis, "Design Whys: Designing Web Sites That Sell"