You mean as in drag the window up to the left corner, then go down to the right corner and yank the resize handle until the window fills up the screen? Sure, but that's like 10 times more cumbersome than clicking a single button, or dragging the title bar to the top of the screen like in Windows 7.
Uhm well let's see... You're not an experienced Mac user. The + makes the window full screen at certain programs. Programs which NEED it are using it. The programs which don't, don't (like Safari). So is there anything wrong with that? It's much better than when every program would go fullscreen with the +, some windows don't need it. Besides, I won't be able to see the desktop anymore when that happens
The + is great.