I had a similar experience to ash66 off the TOM ex TRN last Sunday (26th). Also off the Flybe from SOU on Thurs evening last week (though not as long to wait, but still a good 20mins).
I don't monitor it, but subjectively, I'd say more than 70% of my arrivals in NCL with checked baggage see long waiting times. Arrivals after 7pm, virtually 100%.
Recently, I've noticed that the bags don't come through on a continuous basis, but in small batches with large gaps in between.