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It is has taken me years of using windows and Linux for find all the neat little applications I use with them today. In many cases I have tested 7 or 8 applications that did mostly the same over periods of time before deciding which ones I liked best. In other cases it is a very little known application with a very specific function that was difficult to find.
I have a feeling that my experience would mostly mirror Mr. Yanosko's, but I think the expectation that I would be able to just jump right in and find replacements for all the applications it has taken me years to find would be unrealistic.
He bases his assumption that there is as much Linux software on his relatively short time using and finding software on OSX.