I can confirm that as of last week when I was there, they were still using the Marketplace dock only - the boats for within Disney Springs were not running, so no access to central or west end. All entries to Disney Springs go through security from busses or on foot, or the parking garages. When walking over to Marketplace from Saratoga, you pass up the first entry spot by the Christmas store, and enter in between where the old Wolfgang Pucks used to be. When exiting the busses, there's a security passthrough as you go through the portal next to the watch store.