The dollar sign operator ($) for function application in Haskell is quite awesome at eliminating levels of parentheses: alpha (beta (gamma (delta epsilon))) = alpha $ beta $ gamma $ delta epsilon.
Some people find Lisp unpleasant because they are allergic to "too many parentheses". Would Lisp have been more a successful programming language if a dollar sign syntax had been part of the language, a syntactic sugar perhaps akin to quote and comma, from the beginning? Does Lisp frequently have last-heavy parenthesized expressions which would benefit from dollar signs? We possibly also want currying.
Seems vaguely related to tail recursion.
Also previously vaguely related: Syntactic fold.
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