just my 2 cents:

Q1: You can also look at bicep. I used both terraform and ARM template, personally speaking, bicep is my current preferred option at the moment. It is much easier than terraform as no state management required.

IaC itself requires work and efforts. It is pretty standard practice for cloud apps especially when there are multiple environments and the app is client facing. (not just a POC)

Q2: click-ops might be ok if you are just exploring and learning. We would eventually get into trouble when there are multiple devs in the team, or you have multiple env to manage. It is very painful to keep different envs exactly same by click-ops. Imagine what might happen if your application code is not version controlled.