Why Web Pages of a Site Shouldn't Be Dramatically Different

One of the reasons why eyes hurt more on the computer than on TV, is that for every click we do (every page we view) we have to get acquainted with that new page. On TV the picture moves on its own, and the only interaction we do is very basic (changing channels, adjusting volume, etc.).

On the web, each part of our journey on a site needs a decision on our part, so every new page we view needs at least a couple of seconds for us to get familiar with it, and then decide which links we want to click on or whether or not we want to continue reading, or just leave the site.

If pages in a user's journey are very different from each other, then each click will require a certain amount of extra time for the user to adjust to the new page, and that consumes a good part of the visit to your site.

This becomes much more important in pages that are part of one process on the site (registration, shopping cart, uploading photos, etc). Ideally these processes should run as smoothly as possible. The only changes among these pages should be related to what the user did. If they uploaded a file for example, only an indication to the succes of failure should be given, and the only part changed on the page should be clearly showing the next step in the process.