Same here,much better if you know a day or two ahead of time who's going to be working then I can plan ahead,especially during the day where it takes some planning ahead to make a noontime appt. work.
Having the current schedule posted also works when the urge comes up out of the blue and if there's someone working that I like or have been thinking of seeing,I'll often make the call but if there's no schedule,I usually don't bother.
It would also save them a lot of unnecessary phone calls if they would post it,even if it was only for the next couple days.