[II2II]

In the context of this article, "average user" and "power user" does not have much meaning. Take the copy-paste example. One group of users is going to find paste-with-formatting more practical while another group of users is going to find paste-without-formatting more useful. The distinction has more to do with the task at hand than the ability of the user. Consider someone working withing a document or within a set of documents for a project. Losing formatting means they will have to go back to recreate it. Now consider someone pulling information from various sources. Maintaining formatting means a loss of consistency in the destination, so it is less desirable.

As for the opinion of average verses power users, I suspect it has a lot more to do with expectations. Power users are more inclined to expect software to do work for them, while the average user seems to be willing to work for the software. As an example, take a table that spans multiple pages. Power users will expect an option to add the table heading on each page, while the average user will do it themselves manually (even if the feature exists and even if they have to redo the work each time the page boundaries change).