I lived in NYC until recently and I do wear my rings on different hands, but only because they look better that way. I never noticed this to be a trend though.
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I don't live in NY anymore but i visit often as I have many friends and relatives there. I never saw anyone wearing their wedding and e-rings on separate hands. Those that have both that I know (including my in-laws, some of whom are lawyers and some investment bankers and they live in either Manhattan or the swankier parts of Long Island) wear everything on one hand--the left, just like the rest of the US usually does.
I have to say even though its a little off topic though, that the portion of NYC that has the big bling is not as much as people seem to think it is. In Manhattan there are lots of artsy types (including many of my friends) who don't wear diamonds at all (NY seems to have more than its share of those who are concerned about 'blood diamonds'). And when I've been in Manhattan, including many of the swanky areas (like the Yale club) 'most' people do not have huge bling--there are a lot of women with no engagement rings on at all in fact (either because they don't have--or because they save it for the opera and galas--but NYC is full of working class people who probably don't have).
Thats kinda what I thought...I see more women with just bands on, some with diamonds and some without, than with really big diamonds. Of course there are people with some major bling, but I usually spend more time downtown and the people seem to be not so interested in the bling even though they could afford anything they wanted...it's just interesting to see what different populations of people wear.