Funny, my 2008 Yaris has the instrument panel in the dead center. The Echo had it that way too except it was turned slightly towards the driver. I actually like it that way, gives me a glove box behind the steering wheel and the steering wheel can't block the gauges. Driving other cars that has been a problem for me.
They moved it behind the steering wheel for the 2012 model.
Back to the OP comparing the Yaris to the Prius, I don't think that's a fair comparison. The Prius is a larger, roomier, comfier car. If you're looking at a Yaris you don't choose a Prius to save gas.