We've never "just sat there" when doing the self serve laundry. Even before the "laundry is ready" app feature was available.
When you start the washer, it indicates how long the cycle is. Usually 45 minutes or so. Plenty of time time to head up and get a snack/drink and be back to move to dryer (which will also tell you you how much time you have before the load is dry when you start it).
We typically put the load in the washer and then either head back to our room to get our stuff organized, or get a quick snack. Then back to move load to dryer and just go up on deck to sit for a while. Then back to get dried clothes, fold and put away.