We were there last week and rope dropped twice to MK via the walking path - which is just lovely, by the way. On Monday 6/21, it wasn't the "official" rope drop procedure they have again now. We arrived at 7:10am at the turnstiles, and they opened up at 7:15 and we were allowed to walk up to 7DMT and queue up for the ride, which they opened around 7:30ish. On Friday, 6/25 we arrived at the same time, they opened the turnstiles at 7:15, but we were held for Rope drop at 8am at Cheshire Cafe.
On neither day were we held at security, although the location of security changed from by the lines for the boat on Monday to the other side closer to MK on Friday. I'm not exactly sure when the first buses arrived, but on both days we were close to the front of the pack to get into the park, like maybe 8-10 groups back? I feel like the buses came after we did, since waves of people started to show and they opened up more lines for turnstiles. I don't know what will happen as they increase capacity, but that was our experience. I'm with you about that, though - being able to walk there and be in control of your own destiny (to some extent) was a big part of the draw for me for GF!