The question in the subject line is not accurate. I use the programming language which is inmy opinion the best to reach the goal of the application as fast as possible. Personally I prefer the mixture of C and Assembler. I'm interested in how the syntax of the programming language affects the resulting code and its efficiency. And the people say - it isn't any connection. I cannot believe ;) But maybe they are right.
In the past worked with an experienced programmer, and he said that the syntax of the language always affects the resulting code. He said, that the syntax of the language forces methods used in compiler to, in example, pass the results and parameters.