There have been a few comments about long waits for the showers recently, so I thought I would add another data point. I was in the lounge last week on a Friday at 14:00. The lounge seating was busy, but I was number 6 in the shower queue and it took around 5 minutes. They weren't bothering with the geolocation nonsense, they just did a tannoy announcement.
I'm back at Schiphol at the same time this week so hoping for more of the same!