Yes, this is fine... if you're running LINUX!
How about for WINDOWS? I'm looking to upgrade from 1.1.2 to 1.3.3.
I have previously (years ago) upgraded to 1.1.2 and it was a nightmare trying to figure out Windows equivalents for the shell scripts and utilities (rsync, anyone?) that are referenced in the upgrade guide you linked to. Nothing but pain, pain, pain.
I should also include I'm running PHP 5.4.13.