I'm don't put too much stock in cadence for my style of riding. As a Triathlete you're essentially a time trialist and running bigger gears at a slower cadence is just normal.
As a personal thing, I just found a comparatively lower cadence suits me. Had I been introduced into this Bike Riding as a cyclist, perhaps I would have found spinning more to my liking. To be clear my relatively low cadence is not layman slow. I'm not really sure what my cadence is, perhaps I'll count today when I finally ride but, probably 70 -80 rpms.
Like C-Cat, I believe the spinning is more Tour/Recovery related. However, I'm sure there's a correlation between power vs cadence vs gearing and may be worth exploring for those motivated by that type of thing. What ever gets you out there enjoying the ride or improving your performance...or enjoy the ride by improving your performance.
Now which Ironman will I choose today?