Hello Michelle,
Thanks for your questions about header content. In WordPress themes, header content is very important because it can tell a lot about the site, often contains navigational control for the user, and performs a lot of code work behind the scenes. Having a header is necessary on the web.
However, there are ways of making the header content less visible. Some of the BoldGrid themes have smaller headers; these include Wedge and Hifidel. In order to replace the header content with the page title and still retain the header’s document information for the web (and search engine results) requires custom theme design for which you would want to work with a developer.
Best,
Christopher M.