We spent one night at the Swan a few years back. We spent the day at Epcot and then park hopped to Hollywood Studios for evening extra magic hours. We took the boat from Epcot, but made the mistake of stopping at the hotel between parks.
When we went back to the boat launch, the line to go to DHS was HUGE and all the boats were already full of people from the Boardwalk, Beach, and Yacht Clubs. We ended up walking to DHS, which was a huge pain because it was the last day of our 8-day trip and my feet were in absolute misery. (This was before I started walking for exercise, and a week at WDW really did a job on my feet and legs. Now that I walk regularly touring WDW isn't a problem anymore.)
So take this into account if you're park hopping for EEMH to either DHS or Epcot. Especially Epcot.