Pedalling faster in a lower gear is more efficient to a point. Your legs are moving faster but the muscles are straining less. By your logic it would be as easy to move an articulated lorry a few hundred metres than it would to ride up the Gap.
I have a theory that the larger one’s build the lower one’s ideal cadence would be, since the losses involved in pedalling faster come from the changing direction of your legs as they move up and down, which is more effort if they are physically larger. But that is just a theory that needs testing.
Grinding up climbs in huge gears is not efficient. If you have such bad habits then you should listen to those who study these things and break them. I used to pedal everywhere at 60rpm, then I tried pedalling faster. It felt weird at first but surprise surprise, the experts were right and now I average 80 on most road rides.
Anyway back on topic – I love triples, you can pick the right gear for the effort you want to put in on the climb. I hate compact because there’s too big of a jump between the rings. Most mid-low end bikes afaik come with a triple shifter and the stops on the mech have been wound in. Although mine came this way with a standard double on it, it had a double mech not a triple, which was annoying. £20 sorted that out tho, but then I am running 105 🙂