> No more having to re-type code because I'd used-up all the line numbers between line 110 and 120.
Line numbers are arbitrary, you can just use GOTO to jump to some out-of-line code then GOTO back at the end. It gets a bit spaghetti'ish if you do it lot, though.
Even back in ~1985 I'd have felt bad about such a practice. And I had only the very vaguest notions about "structured programming".
The school I went to only had a cpuple of computers, so I wrote code longhand on A4 lined paper. When I needed to insert lines, I wrote them on a slip of paper that I placed at the appropriate place on the page and stapled on the right-hand edge.
Line numbers are arbitrary, you can just use GOTO to jump to some out-of-line code then GOTO back at the end. It gets a bit spaghetti'ish if you do it lot, though.