You claim, significant whitespace helps mitigate "goto fail" errors.
As for me, indent syntax allows more human errors during refactoring. When moving code blocks around, you can easily misplace whitespaces and compiler/editor has no ability to help you.
This is definitely an issue, but isn't one I run into often. Just like if I'm pasting code in rust I need to make sure it is inside or outside an if statement, I likewise need to ensure pasted code in ante is inside/outside the if statement by looking at its indentation relative to the previous line. The compiler can help somewhat here, just not a lot. If your indentation is not on an existing indentation level you will get an error since you cannot randomly start indent blocks in your code. I do think the biggest detractor of indentation-sensitive syntax in general is the loss of auto-formatting indentation though.
