I'd say that 95% of riders that use it on the street do so so they can say they've got 'GP Shift'. Just like Rossi you know. Makes me fast right. Because that extra 10th of a second on the road is the difference between glory and failure.
My point is, the trickest road bikes you can buy are all 1 down 5 up. For whatever reason, be it just convention or there's an actual reason, that's the way they are. We've had everything trickle down from MotoGP or other racing, radial brakes, upside down forks, traction control etc etc, but the shift pattern for the street has remained the same.
But hey if you like it better, all the power to you.