It's gotten so bad even non-peak direction or well outside of peak hour is often still a terrible drive.

If we had good public transport I'd never do it. But even with traffic as bad as it is, it still somehow takes longer to get to Landsborough than it would to drive. And Landsborough is a ridiculous place to have the closest station to the Sunshine Coast, because then you've somehow got to get across to the coastal towns. Roma Street to a Caloundra Station should be doable in under an hour, and then a little more to continue up as far as Noosa.