MacOS for Flash/Flex Development

I'm seriously considering making the switch, at least at work, in order to improve the workflow with my co-workers. I am a aware that a great number of flash developers work on Macs; however, being an all-time PC user, I am a little bit concerned about how the learning curve might affect my productivity. Any advice?

I guess the question is kind of complex, since Flash/Flex development involves many things other that the Flash IDE and Flex Builder. For example, I use Enterprise Architect on a daily basis and there's no Mac version for that; I know that I could run that particular software with Parallels, but that means that I am not actually replacing my current OS, but just adding a new one in the process. That is not a bad thing, but I want to find what advantages do you think MacOS inherently provides to Flash dev types.