Wanted to add my experience from this past weekend.
My husband and I went this past Saturday and arrived at the box office around 10:38am for the matinee (box office opens at 12pm). When we arrived, we were 5th and 6th in line. It was cold and rainy day - not to mention BroadwayCon was happening so we figured we would have better odds with fans attending that instead of lining up.
Less than five minutes after we got in line a group of three arrived behind us and within 15 minutes the line was up to around 15 people. In that time, a girl also joined her friend in front of us bumping us to 6th and 7th in line. Unlike some other reports, no one was monitoring the line. I didn't push the issue as I knew we would get in and I assume she just went to grab a coffee as the person in front of me didn't say anything to her.
By box office open the line was probably up to around 25 people. As expected, my husband and I got tickets - SRO Spot 2 and 3. The group of three behind us (8th, 9th, 10th in line) also got tickets. We didn't stick around to see how many more tickets went after that.
Spots 2/3 for standing room are the closest to the center aisle behind the Right Orch. Great view with slight obstruction of the balcony which isn't a big deal and it's easy to lean down to see if you want to make the effort. Reeve also stages up for his entrance right behind these spots during Flowers. For less than 1.5 hours in line and $39, I would do this over and over again.
As for the show, we saw Hadestown last January in London - I thought it was okay and my husband disliked it. The National Theatre was a horrible venue for it (too big/concrete walls messed with the sound) and the story telling definitely needed work. What a difference a year (and new venue) makes! We were blown away by the show and Hadestown now ranks at the top of my favorite musicals. The show is stunning from beginning to end and the Walter Kerr is a perfect home for it. Sadly, Andre was out on Saturday but we were lucky enough to see him in London and T. Oliver Reed did a wonderful job in the role. My husband actually commented that he was much easier to understand than De Shields. The rest of cast was in and I can't express how incredible they are together. There is something special about the chemistry of this group - they had the audience in the palm of their hand the entire show. I'll definitely be making a trip back to see the show again soon.