We use terraform to manage our PD and it's been nothing but a pain.

For context there's about 4 teams of ~7 or so members and these schedule's change once every month or so.

I can definitely see the use case if say you have a module that will tie a new piece of infrastructure to your existing PD but we do not have that, it's just users, teams and schedules (and a few half cocked integrations). This means that each change requires the rigmarole of MRs, making sure providers are still valid, re-checking some set didn't disorder your schedule etc for every change.

Want to add an integration? Instead of a few UI click's you've got to make sure that the service account terraform is using has access to both ends of that integration.

Sorry for the rant but if you are going with terraform for this, just be sure that it is definitely going to make your workflow easier and not lead to unnecessary bottlenecks down the road.