I needed to clear some disk space and wanted to find out if there are any programs I'm not using that take up substantial space.

Thanks to this Unix StackExchange post, I can do this:

dpkg-query -W -f='${Installed-Size;8}  ${Package}\n' | sort -n

Essentially, list all installed packages with the size first, then sort numerically. I can then read and determine if it's a program I don't use anymore and get rid of it with:

sudo apt remove <PACKAGE-NAME>