Here’s some background, in case you’re not a software whiz. Software languages have specific features, or commands, that are typed in as shorthand for programmers.
Here's some advice, since you're not a software developer. Stop calling them "commands".
One subtle point that I explain in http://www.cawtech.demon.co.uk/lisp/ghost-benefits.html
is that programmers who write big programs that need serious planning can benefit from the presence of programming language features that they do not use. Grepping the source files to count the number of times that advanced features get used is only part of the picture.