There should be an easy, transparent way to structure a blog. Setting up categories and clicking radial buttons as you post new items is NOT rocket science.
And frankly, over time, a blog without structure is simply a messy diary. How much is really required on the admin and infrastructure side to allow authors to easily organize a page. http://structuredblogging.org/
And yes, I've heard that "people are lazy". You will always have people that email a question to the person in the cubicle next to them.
But will most people use simple tools provided to them if there is an inherent value? I point out the amount of people that use the calendar that accompanies their email software. There is value in this addendum to the program. And isn't this a frequently used tool in your office?