I just returned home from a Universal trip that went from Dec.5-8.
My wife and I got to ride Hagrid's five times during the trip and twice in the front motorbike -- once at night and once during the day. The wait times were constantly listed, it seemed, at either 90 mins or 120 mins when we'd check. And the three times we went in at the 90-minute mark, we were in line to the exit in less than an hour.
Yesterday we were at IOA for rope drop and the line for Hagrid's went into The Lost Continent, but it didn't stay there long. They eventually took down the rails making this the queue. It appeared to be in place more so for riders to be organized so they could stay in line and then pass the lockers.