The new shiny that has me most interested this time around is being able to spin a "development playground". Using Disposable VM templates, I've populated both #Debian 10 and #Fedora 32 environments with my #Emacs settings, and tools for #Python and #Rust #development.
This lets me use powerful DispVMs to serve as staging grounds for things I'm not sure about using in Template/AppVMs yet, and then qvm-copy/move any notes or code I care about into Qubes with persistence for later use.