I do the same and I second Horse Cave if you are on I-65. That was our stop for years on our way to SE Ohio. We don't anymore because we discovered Bardstown on Bluegrass Pkwy once it started growing.
They've also added a Buc-ee's recently between that and Franklin but I can't remember the exit. I'll check today as we are heading up there for the weekend because my nephew is getting married.
I passed that Buc-ee's during my spring break visit to Nashville. Traffic was backed up at least half a mile off of the exit on the way down but wasn't an issue on the way back up. I went once, I think it was Crossville, not my cup of tea but I see the appeal for some people. It also seems like a decent job, I hear they pay well relative to other retailers.