Its still big business here in Hawkes Bay, New Zealand. I went out for a nosey one night late last year and there would have been 30-35 helos in a 5k radius through the Twyford- Gimblett Gravels area. Mainly 206's, 500's and 350's although i also saw a R22 and a big bell (205 or re reged UH1?)
I have spoken to a few vineyard managers, one of whom told me that one year they had three frost events, at 6-8hrs flying time with 2 Squirrels 2 nights, 3 the other and their total cost for the season was less than 10c per bottle of wine. Cheap insurance I'd say.