Our main use is for patch management and cataloguing our RHEL infrastructure. Keeping inventories on spreadsheets and maintaining them is a tedious detail. Satellite allows us to have an up-to-the-minute inventory of our servers.
Satellite allows us also to review configuration issues with the 'all ansible roles' feature which helps us ensure that a) the servers are connectable and b) they are configured similarly as expected.
Due to the cloud connecter, our inventory is uploaded on a regular basis to cloud.redhat.com (insights) where we get insight into configuration issues, specific vulnerabilities to address, et cetera.
Having Satellite has enabled us to maintain control of our RHEL infrastructure without having to hire additional help due to the size of the environment.