I feel your pain, and while I agree with Lisa on the fact that this is the best thing for Mac users and that it might take more than a week to get the hang of it, after 15 years of daily work with this software, I still get unbelievably frustrated. And not much for the way Rapid Weaver works, but for the fact that it often does not work as expected.
I create, change, update content for online classes; they include text, images, videos, PDFs, password-protected pages, content that is timed-release, data pulled from my Google Spreadsheets or from txt files saved in Dropbox, online chats, forms... you name it. And I cannot find any other software that allows me the same kind of flexibility (not to mention the immense help of third party developers who will work with you to fix or fine tune anything—sometimes even tailoring their stacks to your needs!
And yet, after so much work, so many years, so many versions and so much money I spent on it, every single release tries to fix a bug while re-introducing a previous one. As a result the FTP engine will work only if you cross your fingers hard enough, or unless the app has decided that it's time for the usual dance routine of crashes. The suspense following the crash is also quite nerve-wrecking: will my last changes still be there? Or did the auto-save feature stop working 20 minutes ago? Sometimes I just pray that the latest upgrade did not disable that again (as some times that's how they temporarily fix these issues). I could go on and on listing the memory leaks, the beach ball galore, the sudden peaks in CPU usage (whether I'm running the app on the latest Mac Book Pro or a fast iMac), but what's the point? There are indeed many web design applications for Mac that won't suffer from these bugs (or at least not after 15 years of development) but they're also not sophisticated enough to allow me to do what I can do with the RapidWeaver's stacks. If only I could do it in 1/4 of the time RW's bugs make me waste, I'd be a happy customer.