ever get in a car on a hot day and its nearly unbearable for the first few minutes? or on a cold day and have to wait a few minutes for the engine to heat up for you to get hot air blowing?
with keyless ignition, if you know its going to be cold in the morning, you can set all the settings to be blowing hot air when you last get in the car. and in the morning from inside the house, hit the keyless ignition and your car starts and has a chance to warm up before you even go outside.