I've been an EMT for 2 1/2 years now...6 months BLS IFTs, then 3 months on a CCT IFT unit, then switched companies to where I did BLS IFT and 911 response for about 6 months, and now for the last year or so have been working on the ambulance for a local FD doing ONLY 911 response.....Easily half of all my 911 responses/transports resulted in us doing the exact same thing as the inter facility transports.....code 2 BLS to the requested facility with nothing more intensive than checking vitals...Of the rest where we transported ALS, only a small fraction actually required immediate interventions to prevent loss of life, limb, or eyesight.
So IME yes, every once in a while we do get to play hero and save a life, but those are a very distinct minority for the majority of 911 calls, which in reality, don't really need much more than transport.