"how many lines of code do I have to read in order to grasp what is going on and what can I do to solve my problem?"
I'm not sure that lines of code alone are that useful here, or APL would be everyone's idea of a perfect language, since it can express so much in so few lines.
The Lisp community in particular seems to value verbosity over terseness, preferring long, descriptive function names and variable names, which make for more lines of code, but arguably greater readability.
I personally value clear code far higher than terse or clever code. I'd much rather read over a page of easily understandable code in 5 minutes than puzzle over a single line that does the same exact thing for an hour.