Do you think memberships to places like the zoo, children's museum, public museum, botanical gardens etc is worth it?

We were gifted a membership to the children's museum when my oldest was one. Unfortunately we didn't get a lot of use out of it, maybe because of her age/schedule at that time I really can't remember. I debated last year about getting a zoo pass but decided against it after overthinking it for 3 months. Maybe it's more appealing when kids don't need naps and are more able to get a lot out of the memberships?

What are your thoughts? If you DON'T have any memberships, how come?