I've used FreeBSD and before that Gentoo (which has a package manager, portage, influenced by BSDs ports system) for more than a decade, and I've never understood the appeal of apt or the other Debian tools. In my experience, they just don't work as well as ports, constantly require adding additional repositories (because the official repository is missing some relatively popular package for who knows what reason) - which may or may not conflict with others I have -, and in general, are just more work than ports, portage, or MacPorts.
Inflicting apt on a system with a superior package management system seems like a sysadmin's bright idea - having no experience with ports or other package managers.
I've used apt on several systems - Maemo, Debian, Ubuntu, OS X (as fink), and always found it to be one of the weakest package managers (I've even had better experience with yum/RPM).