My son has been going to nursery since he was 11 months old. Initially I was apprehensive but that went almost instantly.
He absolutely loves nursery and is coming up to 2. His nursery is mostly outside but it's not a case of "just childcare". He does drama sessions, gardening, outdoor play, building, crafts, yoga, community walks, reading, painting, baking etc etc. When he gets to preschool they spend the majority of their days at their forest school.
I physically couldn't do the number of activities he does in one day at nursery at home, he absolutely loves it and interacting with his peers. The first lock down when he didn't go for 10 weeks he became really withdrawn, quiet and fearful. Within 3 days of being back at nursery he was back to his outgoing, independent and chatty self.
My friend wasn't going to send her daughter until 3 when the free 30 hours kick in (Scotland) but with the pandemic her usual clubs and social interactions were gone. Her speech development has come on masses in the 3 months she has been attending.
It's personal choice of if to send them but its definitely positive for them. My friend is a reception teacher she says it's easy to tell the ones that have gone to nursery. It usually takes the ones who haven't a few months to reach the same level of confidence/settled etc.