Yes. The code I produce in a year I could type in a week. The time goes into understanding the problem. You're not going to get significantly more code without reducing the level of understanding.

"Everybody has a plan until they get punched in the mouth (at runtime)." - Mike Tyson

This happens a lot, which is why agile-style methods kept popping up to replace waterfall techniques, even before anyone tagged them with the ‘agile’ label.

Ironically, that led to a Agile™ consultant-industrial complex that tried to make it a cookie-cutter process again, but we still haven’t escaped the need to break out the IDE and actually put idea into something concrete, and I doubt we ever will.