this sounds very much like inexperience.
One of the things the guy missed is there in plain sight in his essay:
You need to get to know the libraries, struggle with the environment, find or tune a text editor, look for tools, and so on. Most of the effort has to do with housekeeping chores, which are surely not mind-expanding by anyone's measure. If you hope to be productive in the new language, things are even bleaker: proficiency has less to do with the language itself than with the myriad technologies you must master to use it effectively.
Unfortunately, everyday productivity is a lot of housekeeping chores, one after another. While your higher mind is soaring with the architecture astronauts, the rest of your mind had better be editing text efficiently, and running top and netstat, and administering the version control system.
And more than half of the point of learning a new language is to force yourself to experiment with a different tool ecosystem. The point of learning Ruby isn't just to learn Ruby: You get to learn about Rails and Capistrano and the obsessive use of test-driven development and, in my case, git. (If I'd been a kernel hacker, I'd have known about git. I presume the Rails folks learned about git because some kernel hackers, seeking to learn a new language, wandered into the Rails community.) You want to be forced to experiment with different tools because sometimes they're better: git is just a much better tool than Subversion, and don't get me started on CVS. Even when the alternatives aren't better, you become a better technologist by playing with them. If I'd never played with a Java IDE I would have no chance of understanding how Java programmers think. If I'd never actually deployed both Rails and PHP I wouldn't understand why PHP deserved to live. (Yes, it's filled with stupidly broken parts, but it's so easy to deploy, and it's fast, and it's not that hard to comprehend.)
The other thing this guy doesn't seem to understand is that there's a difference between tourism and living in another country. When you "learn a new language every year" that doesn't mean you have to become a pro in your new language. You can visit, kick the tires, read a couple of introductory books, write some simple code, read some code to something more complicated, and then move on. Yes, that means you're a dilettante -- but it's better to be a dilettante than to blindly plug away at the same thing for a decade.
Here's a short talk I wrote on the subject:
hint: look for blub programmer.
"Doing this is like doing a really bad thing, which by the way you shouldn't do."