I've been on two Disney cruises so far and I don't have kids. I've also cruised RCCL and am a far bigger DCL fan.
There are a lot of definitions of "family" and I think DCL does an incredible job making sure there's something special for all of them. IMO, DCL pays a lot more attention to providing areas for kids, areas for families traveling with kids that want to do things together, and areas for adults who might want some time away from kids. As one would expect, the vast majority of things on the ship are kid-friendly. Once onboard, I really don't think you'll find that you feel limited or that big parts of the ship are cut off for you.
There are a lot of definitions of "family" and I think DCL does an incredible job making sure there's something special for all of them. IMO, DCL pays a lot more attention to providing areas for kids, areas for families traveling with kids that want to do things together, and areas for adults who might want some time away from kids. As one would expect, the vast majority of things on the ship are kid-friendly. Once onboard, I really don't think you'll find that you feel limited or that big parts of the ship are cut off for you.