I haven't seen many useful applications yet.
Just because you didn't see it doesn't mean the AI wasn't present. Haven't you been to the doctor in the last few years?
Artificial Intelligence: How is It Changing Medical Sciences and Its Future?Artificially intelligent computer systems are used extensively in medical sciences. Common applications include diagnosing patients, end-to-end drug discovery and development, improving communication between physician and patient, transcribing medical documents, such as prescriptions, and remotely treating patients. While computer systems often execute tasks more efficiently than humans, more recently, state-of-the-art computer algorithms have achieved accuracies which are at par with human experts in the field of medical sciences. Some speculate that it is only a matter of time before humans are completely replaced in certain roles within the medical sciences.