Our family had the same experience as @rumbypumby - slower pace of life, weather was good so we got out in the back garden. Took it in turns to walk the dog. We face timed with friends and had quiz nights or played games online with them. With an autistic child this quiet time was beneficial. Going back to school was trickier for them as they became overwhelmed quite quickly but working with school we did a phased return and that helped.
During lockdowns, I worked on a rota providing teaching in school for kids whose parents were frontline and those children who were vulnerable for any reason (SEN, SEMH, family issues). Returning back full time, whole classes were in their own 'bubbles' so kids sat next to each other because there wasn't the space for social distancing like your pictures show @DoYouWantMeToBeTheCat.
I feel from my experience, seeing what was happening with other parents, was it very much depended how the adults dealt with it. If adults were scared, frightened and didn't engage well with the child, that would impact the child. If adults were calm, took it step by step, and spent time engaging with the children supporting them, then the result was more positive.
For me, the far bigger harm for children in recent years is social media.