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It's not just accessability and navigation.
All web sites are used by the users. (visitors to your site are the site users).
Usability is about helping all users to use your web site.
Which means a lot of things, among them are that dissabled users can have access to your site at all, and making the navigation simple to understand.
A great part of usability is interface.
A web site is the interface between the user, and your web site's content. The best interface is an invisible one. One that helps the user access the content without having to thinking about the interface.
Remember that people visit your site to complete a task.
Examples are finding information, being entertained, buying a product, stating their views....
Usability design is part of making it easier for them to complete that task.
Experience design is about making people's visit to a web site a pleasureable experience, if your visitors (users) are not having a pleasurable experience, they must be having an unpleasurable one, you don't want that do you?
Usable sites are more pleasurable than non-usable sites.
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