Large raft-ups require a lot more attention to detail, the correct amount of anchors, and someone always watching. You need to remember that when the tide changes, stern anchors become bow anchors, most people think they are only there to keep you from swinging, which is not true. Most stern anchors are smaller than bow anchors, so they need even more attention. Too many people see a raft-up and think that they will just tie up, like they are tied to a dock, without regard for the added weight and need for additional anchors.
Large raft-ups are fun, but if the anchors start dragging, it can become a nightmare. I prefer smaller tie-ups, but if the weather is good again, I'm all for a repeat of last year's BBQ