I've been using Platform Builder for over a year, and its perfect for casually making a game, to making a Super Mario World grade level game. If you get used to it's amazing features, you'll be able to make quite a wealth of imagination come to life, without ever needing to learn a single line of code! As a fellow PB user puts it, "Platform Builder is as advertised, and more!"
Beta 1.0 is here, and it's a HUGE update! There are many new features and items to work with, including the ability to create your own items, upload music, travel through pipes, and even fly. Merry Christmas everyone!