Thank you for the response but the key word in there is "some". I've turned off those notifications and my still buzzes non-stop. I changed from Apple products to Samsung and I'm very disappointed in the watch!
Exactly the same sentiment as OP. The alerts are not what I want to disable. It's good to know when it disconnects. What's irritating is the lack of CONTEXT of why the vibrate occurs. It shouldn't be an "unlockable wow mystery solved!" that disabling BT connection alerts stops the random vibrating. The vibrates should absolutely always accompany the watch face lighting up and saying "hey, here's what I'm vibrating to tell you!".
Having it vibrate without anything happening on the screen is like someone tapping you on the shoulder and disappearing.