(Some websites really present information and content in an interactive and fresh way. Regardless, I think sometimes navigation be unnecessarily complicated and prevent a user from finding content easily. I'm all for new and different navigation, but sometimes it can just get too gimmicky.)
Maybe part of the reason it's harder to find content is that we've established a norm of head/side bars. People aren't used to more creative websites like this, and poor website design tends to be basic, but accesible. In addition, a lot of the templates out there use a similar layout.
Maybe if more of these websites existed, people would feel more comfortable with them?