Well, if you're going to clone another install then you can create a list of the installed packages, and automatically install them.
The other way to do is to just copy the names of the packages you like into a terminal command. The package manager can install as many packages as you like in one command. For example:
I have a little text file tucked away of packages that I like to install on a fresh machine. One copy-paste and I can go have a cup of coffee while it sets it all up for me.
sudo apt-get install package1 package2 package3