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PC-Write had it in the 80's.

In LAPIS (1999), you could not only select multiple things, as it could guess what you meant to select based on the structure of the text: http://groups.csail.mit.edu/graphics/lapis/index.html

jEdit appears to have had multiple cursors since at least 2005, though I don't know how useful they were.

Out of curiosity: I looked up the jEdit developer and it turns out that he's currently working on the Swift compiler at Apple!

They worked great and I stayed with jEdit long past when it was reasonable to do so because of that and so many other amazing features.

Why did it stop being reasonable?

jEdit was a seriously under rated text editor, I used the CRAP out of it in college.

Was? It is still being developed, the last version was released six months ago:

nice, I had no idea.

OS X has always had it, albeit a fairly limited implementation. Try it in TextEdit.