I sometimes found with the first Apple Watch that it would be quicker to just pull out my phone to use Siri.
I was supposed to receive my Series 2 yesterday and this was one of the first things I wanted to check, but yesterday morning UPS rescheduled my delivery for Monday.
I think the response time is faster. And I also think the results time is faster. I don't have my original AW0 any longer but while Siri was good before I think it is certainly better
I've used Siri on Apple Watch 1 since I got I got it on release day, and while I've always liked using it, I did wish it was faster - as close to on the iPhone as possible.