Its not the Dunning-Kruger effect, I would call it the osx effect (or alternatively the nosql or ruby effect). It goes something like this: if you can do something in an esoteric way that gets your more respect (both real and imagined) from people in your community, you will do it and lord it over others who do not have this particular knowledge or skill. The respect you get tends to be inversely proportional to the actual value being provided. (ie osx barely gets you any respect nowadays becuase it provides true value for programmers, using nosql at your startup gives you lots of respect even though a sql/mc combo would probably take much less time and effort to actual get running and fine-tuned). This effect generally appears in the following form: i use osx so therefore I am better than Windows users. I know sed so I am better than cli noobs.

The opposite of this is the windows effect (aka the php effect), where you get disrepected for using a particular technology regardless of how talented or productive you actually are with it.