[nneonneo]

If you have tap to wake turned on (it's on by default), you can tap the screen anywhere to wake it up. So long as the screen isn't already on and you don't mash the Snooze button, you should be able to hit stop.

I believe the power-button-to-snooze thing is meant as a usability boost for groggy people: the physical button may be easier to click than some random spot on the screen.

[throw310822]

I will object that the point of the alarm is to make sure you're not groggy anymore by the time you deactivate it.

[temp8830]

But not everyone lives alone. If you'd like to avoid waking everyone else up - you hit the power button (or indeed any button) while groggy. And if you drift off to sleep despite your best efforts - well, that's why the button snoozes the alarm rather than disabling it.