Hi Jessica!
As one who preferably travels to Disney in the Fall/Winter time, great choice on making a November Disney trip! The days in November are not "screaming hot," and generally the foot traffic is a little bit slower. All the pool slides at Disney resorts are open year-round for the most part. Beyond some unexpectedly frigid temperatures, I don't foresee them closing any of the slides unless they see it may become a safety concern. In all my Fall/Winter trips, the pool and slides were always open...
I'm personally not big on the 2 hotel stay, only because I want to pack up once, on my Disney departure date :-) In terms of moderate resorts for your older children, you can't go wrong with any, but my family's 1,2 would be: 1-
Coronado Springs; 2-
Caribbean Beach. Both have very similar amenities: beach, pools with waterslides, arcades. The Caribbean Beach resort also has pontoon boat and canoe rentals. Coronado has a cool pool area (called the Dig Site). They also have a very nice casual dining restaurant: the Maya Grill.
It may come down to personal tastes. If you guys would enjoy a more tropical experience, go with the Caribbean. If you'd like the influence of Mexico, go with Coronado Springs.
Good Luck and Have Fun!