Hey I'm in Disneyland right now too! Here's what I've found:
Sprint has three B25 carriers on air (8109, 8140, 8665) as well as three B41 carriers (39874, 40072, 40270).
Speeds on Sprint and VZW are been slow but usable. AT&T and T-Mobile are pretty much useless.
I wish Sprint would load balance between B25 and B41 better and that they'd run 6 B41 carriers here instead of three - I think those two things would really help with the data here.