Several things come into play on this one. The 2.4GHz (and 5GHz) WiFi signal is affected by attenuation through structures. The more layers in your way (particularly metal), the worse it is. Also, WiFi access points are typically able to handle a certain number of clients per point. Disney uses Cisco and Aruba AP's, which are among the best, but you are still going to hit a limit per AP where it begins to affect the performance. These two factors really kick in when you are in a queue. Most of the queues are indoors, and you have a bunch of people, likely all connected to the same AP. The other factor, which you usually notice as you move through the park and what was once a good signal is now a poor signal, is roaming issues. Disney's WiFi network is a mesh topology. It's designed to allow clients (your phones) to seamlessly move from one access point to another. As your current signal becomes weak, your device should theoretically hop to the next strongest signal. However, most current devices struggle to roam across WiFi mesh networks. They eventually will, but seemingly never when you need them to. A quick fix is usually just turning WiFi off and back on. Once on, it will seek out the strongest signal.
Sorry... really geeked out there for a moment.
. I'm going to use my data roaming next trip.
