To be honest, it used to bug me when I got my first mac, but I learned to appreciate it and now prefer it on big screens. But yeah, for a laptop with a 13" or 15" screen, I can see why you'd prefer it full screen.
I don't know if this still works, but you could create a bookmark on the bookmarks bar set to
javascript:self.moveTo(0,0);self.resizeTo(screen.availWidth,screen.availHeight);
That'll resize to full screen.
