And the bridge over to Disney Springs is just to the right when you head out the back door, just past the boat dock. It's just a few hundred feet over to the west side area if you want to see the drone show from the front, and hardly anyone heads back that way after the show so you're not fighting any crowds.
The only thing to consider if taking a bus to SSR while staying at another resort - to get back to your resort from SSR, you'll need to transfer. After the 9pm drone show, you may still be able to get a few theme park busses running at 10pm that you could board then over to your resort's bus - but once the park busses stop, the only way back is to take the Disney Springs bus - putting you right back in the crowds leaving Disney Springs...unless you wait a while until things calm down.