Coming from the Windows world, I'm used to doing the following (in maximized windows):
* when I wanna close a window, I throw my mouse pointer in the right-top corner (as far as it can go).
* when I wanna use a scroll-bar, I throw my pointer to the right edge of the screen.
* when I wanna open the Firefox All-in-One Sidebar, I throw my mouse to the left.
However, I can't use this in Gnome. After I throw my mouse, I have to bring it back a few pixels.