My husband and I have stayed at the Dolphin many times and the Swan a couple of times. Haven't been there since 2017 so not sure how things are going as far as service, house cleaning, restaurants, etc. due to the pandemic. I believe the Dolphin has had a nice refurb since we were there last.
I don't think there's any perk of staying at a full Disney resort that we missed. We don't need purchases delivered to our hotel, or a long bus ride from the airport (we take SuperShuttle or Lyft). Interesting that the bus from the hotel will now take us to TTC rather than the MK, but I like to ride the monorail so that's ok, and we take the boats to Epcot. It's not true that there is no Disney theming in the common areas. I think there is just enough so that you know you're at Disney but it's not overwhelming.