No, no, no, no, no...
This is one of the fundamental differences in UI that is much better on the Mac. I'm sorry, but an app that is always full-sized just harkens back to the DOS days. Yeah, I can have more than one app open, which wasn't possible under DOS, but having one window always maximized is not really any different from a usability standpoint.
There are some apps that work better at full screen on a laptop but right now, I have 10 apps open and only 2 are typically full-screen, my browser and my email. All the others are scaled to allow quick and easy access between them. And when I'm on a dual monitor set up, nothing is full screen.