Irrespective of losing photo opportunities on an empty Main Street, which I frankly think is something Disney only pushed to make the cost of pre-park opening tours and mealtimes seem more palatable, I think this makes a lot of sense and I want to explain why from my perspective as a former
Disneyland vet. Before I do so, I also want to be very clear that I'm a Walt Disney World vet now and have a very strong preference for visiting the Orlando parks over the Anaheim parks. I shouldn't have to say that, but I know some people get very testy about comparisons.
When I first visited Magic Kingdom as an adult again a few years ago, I was very surprised that they didn't stack Main Street, because that had always been my experience at Disneyland. But also because the esplanade outside the main gate at Magic Kingdom is so much smaller. The esplanade outside Disneyland is this gigantic, unbroken expanse that stretches from the front of Disneyland to the front of California Adventure. Even the security tents are off to the side (and now, half of them are relocated entirely, too.) And even with all that space, the DL esplanade can be intensely crowded, and Disneyland still needs to stack main street at rope drop.
Magic Kingdom's esplanade is smaller right off the bat, and is then broken up into multiple tight, sometimes confusing areas by the presence of security tents very close to the tapstyles, designated pedestrian pathways for park access and egress, and then designated pathways to and from the monorail, the buses, and the ferries on top of all that. Everyone here knows that it doesn't even take a very crowded day to make that area seem like a mad house in the morning.
Until today's announcement, I just never understood why they wouldn't just stack Main Street and take the pressure off of the esplanade area. With this change, at rope drop there should no longer be a crowd of people stretching back to the security tents waiting to be allowed into the floral Mickey area. After security, it should be a very short wait to tap yourself into the park. There also probably won't be any more of that heart stopping, depressing moment when you get off a bus a little bit later than you anticipated at rope drop and glance over to see a gigantic crowd stretching from the security tents to the train station.
I'm not saying it will be perfect, or that it's perfect at Disneyland. I don't think either coast does everything perfectly. But this really does make a big difference. There's also something really magical about knowing, even before rope drop, that you're already in the park. Not waiting stranded in a line or holding pen. But flat out on main street. It's not something I can explain to anybody who hasn't experienced that already, for example at Disneyland. But it's pretty awesome and I think once people experience it for themselves at Magic Kingdom they're really going to understand. There's just a vibe that's way cooler than the way they do this at the other parks, because I don't think anybody really daydreams about the area in between the Innoventions buildings at Epcot or about Discovery Island at Animal Kingdom. But Main Street is Main Street, you know?