Recently returned from a 3 day trip with my wife. It was our first trip with just the two of us, and we wanted to focus on World Showcase which is hard to do with kids. We had an incredible trip! Even though there were plenty of people there, we really never felt like the crowds were too bad. Wait times weren't that bad either given that the parks were at their current capacity limits. The Touring Plans posted wait times were spot on, and were usually much lower than the official posted times. We had no issues with park hopping despite there being no park passes available.
We stayed at the Dolphin, which we loved because we were able to walk to Epcot and Hollywood Studios. They are no longer using Disney buses there, and using the early buses to MK and AK didn't get us there in time for an optimal rope drop experience.
3/11 - Epcot
We spent a full day at Epcot our first day. We went to Test Track and Frozen quickly at park opening and then slowed the pace down from there to enjoy the Flower and Garden Festival. We loved the topiaries, the gardens, and all the amazing food booths! We spent most of the day in World Showcase, though did make it to Soarin' and Spaceship Earth after dinner.
3/12 - MK / Epcot
We weren't able to make it MK as early as we would have liked (8:45 for a 9:00 opening). The line for 7DMT was already quite long, so we went to Splash Mountain first instead. It was probably close to a 30 minute wait. We then went to Haunted Mansion which was a walk on followed by Flight, before slowing down for soaking in the scenery, taking pictures, and shopping before lunch. We ate at Cinderella's Royal Table which was a treat! Afterwards we went to 7DMT and the line wasn't too bad at all (30-40 minutes).
We then returned to the hotel to rest up for the evening in World Showcase. Strolling around World Showcase in the evening was delightful! France was our favorite.
3/13 - AK / HS / Epcot
We wanted to get a taste of AK since we had never been before, so we went for a few hours in the morning. It wasn't our favorite park (Dinoland USA?), but it was good to spend some time there and FOP was incredibly impressive.
After resting for the early afternoon, we went to HS around 5:00. The park had cleared out significantly by then. You can really get a lot done there in the evenings. Mickey/Minnie's was only a 15 minute wait, and we followed that with SDD which was only 25 minutes. We stayed away from Galaxy's Edge since we had just been there with our kids a couple of month's ago, but we really love it there!
Afterwards we took the Skyliner to Epcot around sunset which was incredible -- definitely one of the biggest highlights of the trip! Finished up with another wonderful evening in World Showcase including some live music (Vintage Vinyl) which was nice.
Overall, it was a great trip! We weren't sure what to expect being at Disney without the kids but we loved it!