From my personal perspective - it's a major plus when choosing a language - under the general auspices of "readability counts". I find Python-like languages much easier to read and maintain - and significant whitespace is a not-insignificant factor in that.
It's an advantage for me, not for you. I've had experience with both and I prefer significant whitespace. The only place where I found it to be a problem was in Jade templates since HTML is kind of white-space sensitive (spaces between tags cause spaces in the output). I do like programming with significant whitespace.
No, the Python community consists of a mix of people who think that the manner in which whitespace is significant in Python (most languages have significant whitespace of some form) is advantageous, people who think it is neither advantageous nor disadvantageous that are attracted to the language for other reasons, and people who think that it is disadvantageous, but not so much as to negate other advantages they see in the language.
It is a mistake to conclude that because language X has feature Y, the entire community around language X thinks that feature Y is a positive feature.
That's not an advantage