I'm trying to find out if there's a way to view all Forms that have been created on the instance and possibly their usage.
Your feedback is much appreciated.
Currently that is not possible, you would have to go into each project and see if it has a form. Hopefully when the Forms API is released you would be able to do this by getting all the projects and then check and see if it has forms or not. The API is scheduled to be released in Q3-Q4 2022 based on Atlassian's public roadmap.