Styles help a lot with that, at least for some of the vertical products.
All of the Styles can be pre-created in the company template. These include a huge chunk of what could be called the "company standards". And once all the Styles are created and available in the DWT, it's a lot more work for someone to create a custom Style. So people tend to use the existing ones, rather than create their own. Voila, automatic standards adherence. (Well, for some things, at least...)