Your apt-get scenario only works if what you're looking for is in the official repositories. If not, you have to add those repositories first. That's a lucky menu find in the Ubuntu installer or some random add repo command with some possibly untrusted domain in it.
Then... You get random install errors. Missing so files or package dependencies etc.
Trust me, I've done more googling trying to install stuff on Ubuntu than I ever did on Windows. At least with windows if you had the exe or msi file you were dons 99% of the time. And you almost always found that file on the site for that program.
you spend a couple hours (not even really) setting up a few pieces of software.
Your reward is not to be saddled with unity trash until you realize it's a piece of crap and go back to windows (or OS X).