Is it that Siri is invaluable, or that basic voice controls are invaluable? I use my Android and its unlauded, no-big-hype voice controls to-

-navigate -map -send messages -set alarms -search

It has a very finite understanding, but it accomplishes literally everything I've ever needed to speak to my device (anything more complex would be inefficient to speak to it).

My original question should be reworded to question whether people are using the specific purported advantages of Siri. Most replies seen in here are bog standard basic voice functionality having nothing to do with the advanced natural language understanding of Siri.