I assumed that Elmer_J.Fudd was referring to the 19th-century novelist Jane Austen, but in that case I have no idea what he was talking about.
Jane Austen does routinely use the word “heart” to signify emotions or emotional potential in general (“warm heart”, “light-hearted”, “goodness of heart”, “a full heart”, etc.), but so does pretty much every other writer in the English language. AFAICT it makes no sense to say that Austen “overused” the word or that her use of it constitutes a particular “habit” or “tic”.
But maybe Elmer was referring to a different Jane Austin, and/or meant something else that I just failed to understand.
Huh. “With all my heart” as Austen uses it in character dialogue, in the standard sense of “sincerely”, “wholeheartedly”, “willingly” etc., is still such a commonly used conversational phrase—and even more so in Austen’s time—that I never even noticed it as in any way specially characteristic of Austen’s novels. (Especially since it seems to occur only once in most of the novels, with maybe four to eight repetitions in the others).
And I would never have described that phrase as using “the word ‘heart’ as a synonym for ‘love’.” It would make no sense to say “with all my love” in the contexts where Austen’s characters say “with all my heart”, as in Tom Bertram’s remark about acting parts in amateur theatricals in Mansfield Park:
Just goes to show, as the saying is, that there are as many interpretations of any written work as there are readers of it.
There was a sort of tic in works by the early 20th century author William Sydney Porter. Having done a stretch in prison, many of his characters were thuggish types with a rough urban manner of speaking, but every now and then they would use an unexpected $5 word (back then, $5 bought one a lot of syllables). Not sure exactly why he did that. Probably to keep the reader a little off-balance.
Edgar Rice Burroughs often sent his heroes through “Stygian darkness” – and sometimes “Cimmerian darkness” – on their way to save damsels from a “Fate worse than death.”