I was a member for a few years, so I'm very familiar with the course. I think Northeastern golf courses are at their most difficult at this time of year, when the grass grows best and the rough is thick. It's hard to advance the ball out of the rough now, but it gets easier as the season progresses and the weather gets warmer. Seasonal wind patterns also tend to make Waterbury harder in the spring than later in the season.
A few years ago some kid shot a 61 in US Am qualifying at Waterbury, after which the club added 250 yards to the tips, almost entirely on the holes that were already supposed to be long par 4's, but weren't anymore because of technology.