WOW, I typed a long response but the page crashed. Awesome.
The summary was that apt-get's tools (update, upgrade, install, remove, autoremove, purge) along with dpkg and apt-cache's search functions are a Goliath compared to BSD's pkg_add, pkg_delete, etc. tools.
Basically, apt-get was a lot more intuitive in its search assistance and its connectivity to default repos, among many other aspects.
I hope FreeBSD has looked at Debian's system for some binary package inspiration.