In Why Productivity is Bunk Charlie Gilkey zeros in on the problem with productivity:

… people spend hours and hours finding new ways to be quicker at things they don’t need to be doing in the first place.

Gilkey has more in this vein. On his about page Gilkey writes his blog is:

… for recovering productivity junkies who have had enough of Getting Things Done and want to start getting things done.

I suspect Gilkey is only part way into the recovery process, there's a lot of material elsewhere in his blog looking suspiciously like productivity tips.