The only thing I do in secondary now is the odd occasion where I'm doing some fruit additions or oak spiral aging. For those, since I'm trying to age my way into a particular taste (through periodic sampling), I don't want the extra debris sitting in there at the bottom since I don't know how long I'll age before kegging.
Since my dry hops are only in there 2-3 days, I dry hop all the time in the primary. Less opportunity to get oxygen in there starting to stale my beer.