I had the master of cut-and-paste. I never saw a file from him that was fewer than 1500 lines. I never saw one with fewer than three obvious opportunities for functions that instead were done as cut-and-pasted then slightly-modified code. Frequently seven or more iterations of 10-15 lines of nearly identical code.
Typical line count reduction when I had time to understand his code and re-write it was about 8-to-1.
He was also highly productive ... until things he had written were around long enough that they had to be modified. Even he couldn't tell how they worked.