I think it's too soon to know what it will be like, since it just reopened yesterday. Here's an article from yesterday:
https://www.cnn.com/travel/article/d...ors/index.html
This says you currently still need a reservation. News footage last night showed heavy crowds. On Monday, DS1 tried to get a reservation for yesterday at Knott's and it was sold out yesterday and today. If Knott's is sold out, I would guess Disney would be more impacted. DH drove by last night and said the street was packed with pedestrians, like covid never happened. :/
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Mama to DS1 Punkin (2/04) and DS2 Boo (1/09)