Saturday is the only day I've heard of this year that even had much in the way of lines. I've skied several weekends and they've all had little to no lines and extra space in the parking lot. Saturday set an all-time record but my impression overall is that there are less people than in the past on average, not more.
They were there Saturday because it was a powder day and it's been a thin Jan/Feb until now. Stevens is always crowded on the weekends, at least that's what I hear.