has greenfoot changed much since around 2005ish?
I do not think greenfoot was around in 2005 -- and you did not set up an account here until 2013. Maybe you meant 2015.
At any rate, a bit has changed. Probably best to use the search bar and look for notices of new greenfoot versions (the latest being 3.1.0 at of the time of this response). The rest you will probably learn as you again do work in greenfoot.