A delayed"is Emacs large?" essaylet has, after languishing unloved and beign ignored for quite a while, finally been finished off.
The quick answer is "maybe", it's all a bit relative. With a default Debian install, GNU Emacs 21.4 has almost half the files of a similar Vim installation, but consumes more disk space.
I found it quite interesting that the difference between a "only compoiled emacs-lisp" emacs and a vim installation were fairly small, since "emacs is so large!" has been a common complaint, for at least as long as I have used emacs (about 18 years now). Curiously, it seems like quite a few who champion vi-like editors over emacs are indeed vim users. At least now, there's some not-entirely-soft numbers showing ath while emacs isn't small, it's not exceedingly large, either.