I'm right there with you--don't care much about the numbers at all.
I update my net worth spreadsheet once/month out of some sort of weird obligation, but only update my other spreadsheets every few months, at most (it gets further and further apart each time), and only look at my spending (monthly/annual by category) once/year, once the previous year has ended (and it usually takes me a few months, February or March, to even get around to that).
We track our spending via Mint, but just don't look at it ever, because we don't care--we spend what we want, and save all the rest.
So when I'd update the spreadsheets every few months, I'd look and go "oh, our savings rate is X% this year" just because that's a line on the spreadsheet, but I wouldn't do anything to try and increase that, or change our behavior in any way.
As far as FIRE numbers and math, our income is unpredictable due to real estate (not a typical SWR scenario) and our spending is unpredictable cause we're traveling full time now, and are having a kid, that we pretty much ignored the numbers on those as well when we decided to pull the plug, and just figured we'll have enough, but if not, we'll go make more.
Numbers can be fun, but they don't have to drive anything, if you don't want them to. :)