I haven't ever experienced what is described either (in personal projects or professional work). What I find gives me "coder's block" is when I have coding tasks that need to get done, but don't really require any thinking. Tasks that are just beyond the threshold of being able to write a script to do them for you, but still feel like they are something that should be automated.

In this case I don't think it's a block in the same sense as writer's block, but rather a block due to a lack of motivation, because such tasks aren't enjoyable in the same way coding that involves creative thinking is.