The simile "like herding cats" refers to the seeming intractability of the ordinary house cat to training in anything, unlike dogs. Despite cohabitation in colonies, cats are lone hunters. It is no coincidence that cats are also "clean" animals; the chemistry of their saliva, expended during their frequent grooming, appears to be a natural deodorant. If so, the function of this cleanliness may be to decrease the chance a prey animal will notice the cat's presence. In contrast, dog's odor is an advantage in hunting, for a dog is a pack hunter; part of the pack stations itself upwind, and its odor drives prey towards the rest of the pack stationed downwind. This requires a cooperative effort, which in turn requires communications skills. No such communications skills are required of a lone hunter.
It is likely this lack of communication skills is part of the reason interacting with such an animal is problematic; cats in particular are labeled as opaque or inscrutable, if not obtuse, as well as aloof and self-sufficient. However, cats can be very affectionate towards their human companions, especially if they imprint on them at a very young age and are treated with consistent affection.
Human attitudes toward cats vary widely. Some people keep cats for companionship as pets. Others go to great lengths to pamper their cats, sometimes treating them as if they were children. When a cat bonds with its human guardian, the cat may, at times, display behaviors similar to that of a human. Such behavior may include a trip to the litter box before bedtime or snuggling up close to its companion in bed or on the sofa. Other such behavior includes mimicking sounds of the owner or using certain sounds the cat picks up from the human; sounds representing specific needs of the cat, which the owner would recognize, such as a specific tone of meow along with eye contact that may represent "I'm hungry." The cat may also be capable of learning to communicate with the human using non-spoken language or body language such as rubbing for affection (confirmation), facial expressions, and making eye contact with the owner if something needs to be addressed (e.g., finding a bug crawling on the floor for the owner to get rid of). Some owners like to train their cat to perform "tricks" commonly exhibited by dogs such as jumping, though this is rare.
This cactus tickles me.