By accident today, I found that the built-in application TextEdit still supports column-wise copy-paste operations the way I liked them in old versions of Xcode.
I had copied a column of numbers from Xcode and pasted it into a document assuming that TextEdit would just paste it in linearly and I would fix up the format afterward.
SURPRISE! It pasted in columnar fashion just like Xcode once did. It made short work of my editing.
A quick test showed that I can hold the option key and copy in columnar fashion as well.
Neither Xcode nor TextWrangler can paste this way.
TextEdit just got more valuable to me for doing work.