This is "inspired" from NetBeans: when the user hovers over the tab bar and scroll the mouse, the tabs are scrolled.
I absolutely HATE those little two buttons "<|>" in the right.
Yes, I know about CTRL + (SHIFT +) TAB, but that's just too many buttons to press. And I sometimes don't want to take my hand off my mouse (they love each other). The biggest problem with this approach is that the windows/panel opened by CTRL + TAB is vertical and the tabs are horizontal. That's a perspective change whenever you want to change tabs. It always feels wrong. CTRL + PGUP/PGDOWN would be more suited for this.