Untrue. While it's true that most people use the 'layout' rule, which is the significant whitespace, there is a non-whitespace-significant variant that uses braces and semicolons. You can see an example of how layout is expanded to the alternative syntax at http://www.haskell.org/onlinereport/lexemes.html#lexemes-lay...
Very few languages consider non-indentation whitespace as significant (not counting using whitespace as a token delimiter, which Haskell definitely does, e.g. "foo bar" =/= "foobar").
For Ruby at least "heavily" is a big exaggeration. It is significant as a token separator and in cases where inserting a line break makes the expression up to the line break a valid expression in itself, in which case it is treated as one.
You pretty much only need to remember to separate tokens where lack of whitespace might create a different vald token, and ensure any expressions that you want to let span more than one line ends with something that expects following tokens to make a complete expression.
Personally I can live with that easily. I can not live with significant indentation, on the other hand...
Yes, but many people assume whitespace everywhere will matter when they hear Python's offside rule described. It's a misconception I've found is worth dispelling, since almost no one minds meaningful indentation.
