I did a lot of time in various
DVC during Covid. I did one of my best projects in a deafening chair on the top floor of the Poly lobby.
The best spot I found was the DVC Beach Club library sitting room. Check out a map, DVC is a separate building. It's usually empty, or someone else is working. Also, the sunroom or atrium or whatever they call it (edit: Solarium) right across the courtyard at Beach Club. Everyone is on a laptop. This can be loud. There's a TV, people are eating, and you're right off the lobby. This is accessible from the Epcot skyliner from Pop. Plenty of plugs in both.
The DVC Boulder Ridge lobby is usually empty and it's GORGEOUS. There's a weird private room I got into a few times which was the absolute best. This is accessible by boat from MK, so bus to MK, boat to WL.
The Yacht Club convention center has hallways and hallways and rooms that are always creepy and empty (obviously not if there is a conference). It has plugs and wifi and AC, and no one will bug you. You could work here, but there won't be a comfortable set up unless you can sneak into a room or move a chair around or something. Also Skyliner access.
If a rocking chair and being outside works for you, the viewing decks from the AKL Kidani lobby is surprisingly not crowded, impossible to get a better view. I've done some work from there. Obv kids will come and go. The inside part, I think they call it the library?, usually has some people working, but also has plugs and AC. It can be loud with people eating and it is right off the main lobby.
If you need to make phone calls, this is much harder. There aren't many private places or places where being on a call or Zoom isn't disruptive. I did a Zoom while another guy was doing one about a real estate deal in the DVC Beach Club library. I did more than a few very sweaty and outside.
The business centers are a total joke.
Your room is the obvious answer, but these are some other options.
Bring a portable charger so you can at least leave that on a charger across the room. There are plugs, but they might not be right where you are sitting.