To reply to your question EC, I use kasoori methi in lesser or greater quantities in the vast majority of my curries.
For me, it is the most reminiscent flavour and odour of the curries I was used to in times past.
It was interesting to read Chewy's observations on the avoidance of methi to produce a cleaner lookng sauce. I think most of the curry houses of yesteryear I frequented were Bangladeshi though, and not Bengali which Chewy knows well.