What is Google One? Is this the service formally known as Google Apps or some other service? I find it hard to keep track of all their products because they change so much.
You also get more storage for Gmail and Google Photos (if you didn't enable compression), occasional discounts/free trials for paid Google services and ability to speak to "Google experts" if you have a problem.
Google One is Google's paid-storage-plus-premium-support-for-consumer-products service.
You could view it as, in an imprecise way, the consumer counterpart to Google Workspace (formerly G Suite, formerly Google Apps.)