In general that list includes everything from Rosen Inn LBV to the good neighbor hotels around Disney Springs, to the luxury hotels like JW and Waldorf Astoria (all of which are physically on Disney property and count when discussing what hotels are on property, although not every one gets the same level of benefits). In terms of meeting space, you've got places like the Hilton Orlando Buena Vista Palace with 160,000 ft² of event space, not to be confused with the Hilton Orlando Lake Buena Vista also on property, which has 84,000 ft². The Waldorf has 60,000 ft²+. The JW Marriott has over 50,000 ft², the Drury with close to that amount, a couple of Wyndhams with a bunch of event space, and many more.
Absolutely right. It's not competitive versus an off-site competitor, never mind some of the on-site hotels that are cheaper especially for smaller to mid-sized events. What's funny is that Disney could really make it work if they wanted to but just don't want to bother with the effort because they can sell their rooms to tourists and keep the event spaces for whatever clients they currently have. It's weird because it's clearly a huge investment opportunity if they really wanted to do it but they leave it on the table. I know of at least one major convention coming next year to Orlando that went with Shingle Creek over Disney because of the money, despite very much being interested in having the convention at Disney because many members of the organization probably would have stayed a few extra days for Disney and Epic, and brought their families too - so there would have been additional convention passes sold for attendees who wouldn't have thought about coming otherwise. But the money was simply too good off property.
Among others. Coronado has a bunch but it is not as competitive as one might expect.