I believe we did use them for that purpose once, but that was a couple of years ago and I never see it mentioned. I'm packing for our trip (arriving at CN this Thursday, 4/12!) and this may make a difference in how I pack...we have $450 in resort credit for this trip and since we work out most mornings, it would be great to do a mid-trip laundry service.
We just used our resort credits this past February to cover the laundry service. Same situation as you - we work out every day. We've done this on our past few trips, and have always gotten our clothes back that same day. It's an excellent service.