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Well, it sounds like you have a reason. I seldom use a secondary but dry hopping is an exception for me. I cold crash the primary, xfer to secondary, dry hop and crash again.
Same here, Denny. I tried dry hopping in the conical so I didn't have to transfer and had a hell of a time kegging the beer from the conical (even after burping out most of the dry hops before starting) because iI kept plugging up my inline screen. I only now transfer IPA's to a secondary (more precisely a brite tank), purging the hell out of the vessel prior to the transfer. Makes things go a lot easier at kegging time which is a closed transfer. Plus, the transfer seems to rouse the yeast a bit which adds a bit more CO2 to the head space.
Like Denny says, I do the best to minimize O2 pickup then don't worry about it.