Additionally if it's your first exposure to a non-Algol language, you're going to have a hard time... you definitely won't feel comfortable quickly. But at least going from, say, Java to Python, you can quickly feel fairly comfortable writing Python code just like you would Java! (Your coworkers who understand "Pythonic" might hate you though.)
As an opposite to what, exactly?
> A good programmer can quickly feel comfortable in any programming language.
This is not true. It takes a not-insignificant amount of time to just learn to write idiomatic code, let alone making oneself familiar with all the quirks and idiosyncrasies of libraries and frameworks.