How would teaching during the last year of a postdoc be perceived on the academic job market? How would large and small research schools, master's only schools, and liberal arts schools all look at a post-doc who did 5 years of research and a 6th year of teaching + post-doc at ~50/50? This would be in physics if that matters.
In my, undergraduate-only department we aren't looking for teaching experience as a check box on the incoming CVs, we're looking for evidence that the candidate likes teaching. Because that's what we're hiring someone to do. Of course, if you haven't logged some time in the classroom then there is no way for you to know, but we are perfectly willing to listen to "When I was a TA ..." stories to get a sense of how the candidate thinks and feels about teaching.

And of course, we're looking for a research background that will give you a chance of doing something here, but with five years of post-doctoral research you look good on paper. We'd want to hear you talk about getting some research done with limited resources.