Am an enterprise java developer, not a web developer. I feel PaaS is designed more for the web developer.
I agree with the general observation that IaaS doesn’t impact us significantly.
I feel SaaS doesn’t either. SaaS could offer devops (build/delivery) services for java developer teams.
PaaS has the biggest impact. We have to use the API /SDK provided by the PaaS vendor. Often no SQL DB. Can’t access a particular host’s file system. MOM is rarely provided.