I think the "very large app" idea is something of a strawman. It's used by all languages from time to time in order to say "hey, look, I can be serious too!" but it's clear that with enough effort and familiarity you can write a large app in anything.
I think the real distinction between Javascript and Haskell runs much more deeply and is difficult to talk about. As a hint to the moral here, many of the posts defending Javascript here try to talk about its syntactic flaws as being not so bad. I don't think anyone in the Haskell community gives a damn about syntax—not in that kind of way—because they've all learned quite nicely that syntax is a tiny fraction of what makes a language interesting.
So the real distinction is semantics. Semantics are hard to argue about because it's difficult to distinguish between semantics until you've either studied them in the abstract or experienced several wildly different kinds. It's also hard to argue about the value of different semantics until you've seen those different kinds used in anger.
Prolog is different from C is different from Erlang. Lisp isn't so different from C, but it does have some cute functional tricks. Clojure is different from Lisp in spirit as its semantics are often distributed and immutable, though as a language it cannot be trusted that way, only as a community.
Haskell is far different from all of those because it's pure, lazy, stupidly committed to its System F and Hindley-Milner heritage, and has one of the most interesting and powerful subtyping systems of any language today. It's completely different from everything in my prior list, though there's passing similarity to Scala and OCaml.
Someone might argue that the semantic island where Haskell lives is better than the one where Javascript lives. They might argue historically by noting that Haskell builds upon 30 years of PL research while Javascript is lightly influenced by one, interesting historical point. They might argue categorically by saying that Haskell's semantics benefit so much from being mathematical. They might argue theoretically by saying that Haskell's semantics can be shown to subsume the semantics of other languages (by the uni-typed argument and Dynamic coupled to monadic regions).
Javascript seems to be relegated to saying that it's not so bad because you can get stuff done in it, it's more interesting than C or Java, and dynamic typing is not that bad once you get into it.
From the Haskell perspective, the first two are givens and the last one is silly knowing that in Haskell you can choose to use Dynamic types whenever you like and they become quickly relegated to just the problems they're most appropriate for.