The most day coders I have come across are in the .net field but as I work in this field I don't know if this is true. I suspect java has its fair share of day coders.
However I have met a lot of really good coders who use .net as a tool that has been given to them to use.
I don't want to get into a flamewar but the article did make me wonder if most developers view .net developers as lesser developers because of their chosen toolset. Does this have more to do with the hate of MS or do they really believe it.
From a knowledge point of view .net requries a lot more traditional programming skills than ruby ever does. I bet .net developers don't look down on ruby developers in the same way.