I agree with Nadyne, if you don't have arguments to back up your gut feeling, you should test it with users and gather data to build up your case.
Nielsen and Norman Group have this article showing that users acquire banner blindness, meaning that you learn to ignore some parts of an application that don't provide meaningful information.
Of course, this learning is not application-specific, meaning that people will learn to ignore certain patterns, independently of the application they are using. This means that sometime your application can provide significant information and users may be dismissing because they learned that for the most part of applications they use, having a drawer showing up on the right-hand side does not have important information.
So you can argue that even if the drawer 'judder' down the page, users may have learned to ignore that (specially because those patterns are used in sites with dubious content, and you always want to avoid clicking on the banners they present). Again, you can't know until you test it.
Another thing I've observed in usability tests, even though I don't have data to back this up, is that most users don't use the documentation if it's not in front of them.
I've seen several people struggling for more than 10 minutes to complete a task, even when they saw a link and understood it would display reference documentation that might help them, and they choose to ignore it.
I'm still thinking about this, but at the end of the day I think users will try to learn by trial and error, ask a friend and do some other stuff before trying to find documentation.