Yup. As far as I've witnessed, syncing with either Ohio/Eastern time or Illinois (Central time) is the main bits of the matter. Northwest Indiana is pretty in line with Chicago: Terre Haute (southwest-ish) more on Illinoise. Lafayette (central west/Purdue area) is in between. Central Indiana doesn't matter so much due to Indianapolis. Southeast is more in line with Louisville and the entire eastern edge, once you are outside of the easily Indianapolis area, is more reliant on larger Ohio cities. (Cincinatti, Cleveland, and to a smaller extent, Toledo). Ft Wayne I'm not as sure about, though I think they'd rather stay in line with Ohio's time.

I*m not entirely sure why it is a big deal: Either way, it is only an hour at this point. To be fair, it was more difficult before indiana adopted Daylight Savings time.