[trinix912]

The Xcode interface up to v3 was an even bigger mess. Interface Builder and Xcode were two separate programs, you'd quickly fill your screen with 15 little windows that you had to constantly drag around, open, close, switch between... The IB didn't even have a canvas so you'd have all your screens inside a NIB just floating around the code windows, the inspector panels, the controls toolbox... Want to switch to this or that IB screen? Move all other windows out of the way, then bring the inspector and toolbox back, and so on. Nowadays you just Cmd-Shift-] a few times.

Putting it all into a single window was a good idea IMO, they should just make it more flexible - allow sidebars/panels to be reorganized and windows to be dragged out of the main window.