I personally don't think I see much of a difference between romantic and sensibility. Your post reminded me, though of JA making fun of the romantic notions of Catherine Morland in Northanger Abbey.

How interesting that Marianne and Catherine Morland are close in age, are both romantic, but probably are at different intellectual (and educational) levels and have been cultivated in such a different way, that they are very different. "Romanticism" doesn't sound as good as "sensibility" IMO. :)