It's directly related to how familiar the syntax is. If a syntax is very foreign, it's difficult for your brain to read it, and it is uncomfortable. People don't like being uncomfortable :)
The more syntax you learn, the less new forms confuse you.
Except learning the syntax of a new language is trivial compared to, say, learning a language with new paradigms.
Don't train your brain to run away from the sight of something that is temporarily uncomfortable. It's intellectually lazy and promotes a passive mindset. It's not like all your programming skills just fall apart once you leave your blub language.
The more syntax you learn, the less new forms confuse you.