I love the fact that whenever someone mentions a piece of software, I can quickly do a aptitude search piece-of-software knowing that there's a good chance that it's somewhere in the Debian repository. That means I won't have to get to the website looking for a download link, which, other than saving time, means I just have to deal with just one interface as well as the confidence that piece-of-software is well-integrated with Debian itself, given Debian's exacting quality standards. Debian really is a gem!

[sidenote] The term, supermarket, as used in this context, was coined by some Debian Developer, although I mean it in a different and more positive manner.