After writing my post, I decided to push Siri through its tracks. Holy crap am I impressed!
I raise my wrist, start speaking right away. Worked every Single time. No need to repeat myself. I tried racing through and she always kept up. I put in a bunch of "uhhhhhhh's" and she ignored them and waited for me to finish. I even mumbled and she still recognized every word.
Return times are also very fast. I asked for a Jays score and it came up right after I asked. No waiting.
One tiny but important change in how you interact with Siri: there's no tap when you summon her. Once you say Hey Siri or hold the Digital Crown, she's already listening. The tap always threw me off because I instinctively waited for the tap to begin speaking and sometimes I missed the prompt. Now, the tap occurs after Siri has registered your request. You can ask your question or make your request and drop your arm. Siri will tap you when she has the info ready.
Apple is learning how to make a watchOS on the fly. To be honest, I don't think there's any other way. Real world use reveals how a smart watch can be useful, what's the best way to get around and most importantly, what role a watch does not play. It's meant for micro interactions, so instant readyness and quick feedback is critical.
This is the first time that I felt that I had a reliable computer on my wrist. Before, it was a nice complement to my iPhone but I was aware of its flaws so I didn't use it in mission critical situations. It's quickly gaining back my trust.