I'm a pretty huge Apple fanboi, but TBH the Watch hasn't impressed me since its inception and I've never picked one up. However, with the introduction of the larger screen, and the new health related features, I decided to pick up a Series 4 to see what it was all about.
I gotta say, this is the watch I wanted (and expected) when Series 0 was announced. It's definitely not a must have item, but it is a life changer - by that I mean I find myself taking more walks, working out more, and generally moving around more, and drinking more liquids (WaterMinder) all because I'm trying to fill out these various rings and bio readouts on my Watch face's complications. Driving home today, I was thinking how amazing it is that these watches have complications that directly monitor your heart, or pull data from satellites to give you more data about the world around you. I bet earlier watch makers wouldn't have dreamed these advancements were possible with the old gears and flip displays.
The ability to take calls on the wrist, and even Walkie Talkie has been pretty fun too. As others have mentioned, it also makes other parts of life just slightly bit more convenient, though I'm sure there are still things that it can do that I'm not fully taking advantage of yet.
I haven't wore watches in over 25 years... but I just will stick with this in the years to come. I'm definitely looking forward to seeing what else they can pack into this thing in the years to come.