Most of today's gas stoves have a spark ignition that will try and light as soon as the gas is opened. Once the knob is turned the gas for the burner comes out, and you will hear a "Popping" noise, which is the spark gap ignition. The spark will light the gas and you have a lit burner. So the danger isnt that the room will fill with gas and explode, the danger is the open flames on the cooking surface.
Like I said, all of today's stoves are like this. The last time I saw a gas (propane) stove that needed to be manually lit with a match was in my 1980 GMC Edson motorhome.
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