Here's Fantasyland at 9:04 a.m. today, (so a few minutes after regular park opening):
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And here's Main Street, USA at 9:15 a.m. today:
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The thing that strikes me is the lack of crowds.
Another way of looking at this is with actual crowd levels from our crowd calendar. We use Disney's posted wait times between 11 a.m. and 5 p.m., at key attractions, as a proxy for crowds (because wait times are transparent and objective). We convert those wait times to a 1-to-10 scale for easier understanding.
Here are the actual MK crowd levels for this year and past years, from June 1 to June 23:
2023:
5.1 out of 10
2022: 6.0
2021: 1.8
2020: -
2019: 5.7
2018: 7.6
2017: 6.8
2016:
8.9
Excluding the pandemic summer of 2021, this year has the lowest average posted waits at the MK since at least 2016.
The usual caveats apply: Posted wait times aren't especially accurate, capacity has changed over time, etc.