Not all the theme parks are Disney, just so you know. Disney own four theme parks, two water parks and a shopping area.
Universal Studios also has two theme parks & a water park and there’s also Busch gardens & Aquatica. Those are nothing to do with Disney
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Although to be honest I’m not a Disney fan, but I’ve been to the Disney parks and they are brill!
I’d probably stay in a few different areas outside of Orlando if you aren’t fussed on theme parks. Clearwater, Miami, Key West, Fort Lauderdale & St Augustine are all lovely.
Hotels totally depend on the area. You used to be able to get flights for around £500pp, but now it’s more like £700pp depending when you travel.