I am very loathe to trust this article because a) there are 8 reasons mentioned. If you're trying to change your design, you want the top 2 or 3 that give you the most bang for your buck.

and b) because the author doesn't say where s/he got this data from. Was it a diary study? Interviews? Observational studies? Introspection?

Without knowing how hte data was generated, I don't see why it should be trusted (yes, it may be valid, but would you spend the next 8 hours "fixing" your site based on someone's quickly written article?)