BUT... on my desktop where I use two 27" screens, I vastly prefer having my taskbars being on the "inside" edges where the screens meet. I'm probably not in the majority, though. But just, don't take away my choice!
Lets you full screen apps a lot cleaned too, but that's just my opinion.
All these windows don't fit bottom/top Taskbar and therefore I put my Taskbar left or right of screen.
With multiple monitors, it snaps to the side most one you have plugged in regardless of your primary screen.
I get there's a lot of dragging and dropping involved with the bar, but in Unity it let you set a threshold for mouse speed to limit you going to another monitor.
Just let me put it on the side and do that if I'm dragging something, it's not too difficult.