Maybe not all the stuff, but I have seen many use Gitlab's docker & package registries, I think Gitlab's merge request discussions are miles ahead of Github's (threads without line discussions, can compare versions, etc), the test result integration is okay, we do use the issue boards a lot. We kinda use the deployments, but only for review apps. Merge trains are great too. There might be more cool stuff, that I either don't know about or have no use for, but in general they do provide some great stuff. (Not that Gitlab doesn't also have bad stuff.)

I manage two teams and we use it for "everything" and have as part of our team values to use Gitlab fully.

We are on premium, the ultimate features would be an easier way to replace Jira but we manage with epics, milestones and iterations.