Ok, I grant you it is not what you'd call your usual tourist spot but I am glad I experienced it. Yes, it is a place of work and you fell a little uncomfortable in watching in on these people's daily lives (one woman was bathing her toddler in a bucket), BUT it is also a very historical site and, I think, important to hear that this laundry function still exists.
Would never have expected such a large operation to still be going in the modern city that is Mumbai.
One thing to note is this place is a haven for the street hawkers and many of them - especially small children - will pester you constantly to buy a magnet, bag, fan etc. Just something to be aware of.