Yes agree the crowding can certainly vary. So many D's on our recent PC itinerary on Serenade they used the Viking Crown lounge for the DL, the usual DL for Pinnacles and the SL for suites. We could also use both SL/DL but there was never a seat in the DL...too bad as of course it had the better sea views. The SL was pretty empty nightly.
116 Pinnacles
326 D+
357 D's