It could also depend on what part of the park you’re in. Crowds on Main Street and around the castle are usually packed because of fireworks, and that makes it feel busy to me. This trip we mostly stayed away from that, choosing not to watch the Christmas fireworks which we’ve seen 25+ times (skipping them wasn’t an option when our kids were young).
Thursday night we watched fireworks in GE then rode RotR, and standby was 15 minutes. It was super chill, we got to the viewing area at the Millennium Falcon about 25 minutes before fireworks and there were maybe 15 people waiting at that point, but even at starting time people could get into the area. Friday night we were at DCA, so maybe DL was busier. At DCA the crowds were waiting for World of Color, but having seen it several times we chose to avoid that area.
Both of those nights, the website I check for how busy things are had it at “alright” and then a little later, at “ghost town”. I know those numbers are based on wait times and not crowds, but I can feel the difference between the various crowd levels. I also consistently was checking wait times in the DL app. I don’t expect crowds to be what they were in the 2000s, we were lucky then, and I don’t think we’ll ever see that again, short of days it pours rain. I do think the dynamic pricing has helped correct crowd levels during the busiest times of year. My last December trip before this year was 2018, midweek the same week of the year, and it was much busier that trip. But we had MaxPass back then, which helped.