For the price of MyMagic+, they could have gotten a lot of miles of monorail track.
I can't even count the number of times I've been to Disney it's so many, but the monorails always seem the most efficient to me. They show up quickly, and they're almost always constantly moving while I'm on it. Again, I've been there a LOT and I've never been stuck on a monorail. The buses on the other hand could take 45 minutes to arrive, and even after they arrive, they're driving horribly slow and starting and stopping a ton during the trip. Unless I'm falling asleep, I'm always internally angered by being on the bus because it's so inefficient. Granted they're cheaper to implement and possibly operate, but it's hard for me to believe that the buses are actually more efficient at moving people around. If those people weren't on buses, they'd be in a hotel, park, or shopping district spending money...they'd probably be happier too.