I find the export incredibly useful for looking at a few things:
Correlation between Sense Total Usage and Solar Production vs. my utility providers. Both utility providers only supply hourly export as well.
Sense Detection of AC units - My Ecobees supply 5 minute interval data. It’s clear Sense can benefit from Ecobee integration and supervised learning.
Time of Use (TOU) Billing comparisons - helpful to look at how much I would have paid with different billing plans, with and without solar.
But I’m guessing that Sense will eventually include export for minute or second level data for shorter windows of time. I can’t see downloading a year of second-level resolution data.