I moved from a busy place where we were always with friends with babies and children, went to a toddlers group or music group or swimming or soft play every day and also met friends in their houses or gardens most days, "popped" to shops, did rides on trains and buses for fun ... to the middle of nowhere with no indoor attractions at all and one local toddler's group once per week, when DC1 was nearly 2 and I was in my third trimester with dc2.
I found the change incredibly hard. I also didn't initially speak the local language. We could go out but there wasn't much to do and I knew nobody to visit.
The thing is it was only hard because I was used to having such an abundance of options.
By the time DC2 was a toddler and I was pregnant with dc3 the identical situation seemed chilled and lovely. DC2 was also a different type of toddler to dc1, perhaps partly as a result of a different environment.
There are so many factors that make lockdown fairly easy or impossibly hard, a lot of its what you're used to, how well you adapt as the adult, and crucially what resources you have (on all levels - indoor and outdoor space, toys, big play equipment in the garden, craft and music stuff, personal resources as the adult such as the ability to tolerate noise and mess and lack of personal space ... also whether you live somewhere you can let the child be noisy without annoying neighbours and go for long walks without coming near anyone.)
Some of the same stuff makes lockdown easier with teens - my rural teens are used to not seeing their friends face to face as much as some urban teens. I often think living in the middle of nowhere is unfortunate and not great for teens and feel guilty about it, but at this very precise point in time in lockdown it's pretty close to the perfect location...