I agree to an extent, but I think it depends on the age of the zoo. Just going off of personal experience, zoos like Valencia or Paris Vincennes which are "new' zoos are divided into clearly defined exhibits, while older zoos like Barcelona or Rome are more scattered and aren't divided into clear exhibits.
Exactly. I think that is really true, and mostly because the newer zoos have the luxury of starting from scratch and basing their zoos around clear cut areas which are preferable for theming and making an orderly zoo. Meanwhile, zoos with older leftover infrastructure do not have this luxury and instead have to work around these older exhibits. For example, Vienna, London and Paris Menagerie look as if someone took a bag of exhibits and emptied it out onto a piece of land they are so disorganised (geographically).