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@amszmidt (1) The reddit user meant "Emacs" when he or she said "Lisp Machine", I understood this and answered accordingly.

(2) It does have something to do with having a Lisp Machine at your fingertips! While Emacs is definitely not a Lisp Machine it seems wrong to me to say it is completely unrelated ("nothing to do") to Lisp Machines. Certainly of all the software I have installed on my computer the only program for which the experience of using it is even remotely close to what I imagine the experience of using a Lisp Machine is Emacs, even if people who have used such a machine feel it is far. (And those people probably agree that, say, Firefox is even further).

(3) It is not just having Lisp! I didn't just program in Lisp, I used the integration with the environment I was working in (Emacs). This is not automatic. I've written programs in Lisp which are not interactive, and not easily extensible (you can say it was stupid of me to write such useless programs but I had my reasons at the time, like wanting to know the result of some computation). There is something special about Emacs beyond having Lisp.