Bring your epipen, but Disney does a good job keeping those insects to a minimum. They also have medical/first aid stations in each park and Disney springs.
No wasps or hornets were seen on my visit to the parks. But yes medical should have the supplies for a minor sing. If it starts swelling to the point of an allergic reaction they have ways to escort you off property to a hospital. But again a sting from those sorts of insects is very unlikely.
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