Well, to start, until I showed up here, I'd never left my ship. My program wasn't designed to be transferable. [As her crew had to find out the hard way.] But because the entire ship was fitted with holo-emitters, I could go anywhere, instantaneously. Or be turned off entirely. And as I'm a program, my programming could be altered to instantly change my behavior and allegiance by anyone with the skills.

Though I'm not sure how much of that still applies. Obviously I have a solid organic body, and hopefully I'll be harder to hack. And I'm not limited to one area. I might well be indistinguishable from the real Janeway this way, but I'll always remember being a hologram, with all its advantages and limitations.