Have you been to Disney before, and are you staying at Disney? Will you have a car?
Ok lets start, Disney employs literally thousands of gay Cast Members. You will not have a hard time meeting someone to spark up a conversation with. PDA's in the park, IMO are usually kept to a minimum. You can always get a quick peck on the cheek on the dark rides and such, but just remember, as friendly as the Cast Members are, some of the guests can be kind of rude if your making out in public.
The gay spot on Disney property is Pleasure Island. It's gay friendly every night, but Sundays, Mondays and Thursdays tend to be more of a gay crowd, especially Thursdays when said Cast Members get paid and get into the clubs for free. It tends to get busier later at night, so don't bust your butt getting there at 9:00.
If you have a car, the largest and busiest gay bar/complex is the Parliament House, just google it. Its a hotel with multiple bars, a pool, theater and restaurant. Pretty busy most nights, crazy on Friday and Saturday nights, and early on Sunday night for T-dance.
Lastly, there are many locals on this board, so feel free to ask questions.