A couple of things... first off, give it some time because it takes longer to get a watch into your life.
When you first open it and pair it with your phone, do NOT select the option to install all available apps. That will clog up the works for a while. Then after it boots up, see if it has the update for WatchOS 2. If not, then install it then. I did this twice... first time it took about 10 hours after having let it install everything on pair. The second time it took about 2 hours. If you already have the OS update, then awesome for you.
Then go into the Apple Watch app on your iPhone and select a few apps to install. There are several different options for each app... installing them, adding them to glances, configuring their notifications, and then complications if they have them. Installing it puts it on the icon screen. Glances is a screen you get to from scrolling up your watch face and then going left and right to look at up to 20 glances. Notifications... I got more specific about what notifications I used on my iPhone and then which I wanted to flow to the watch. Complications are special features from an app you can add to a watch face. Give yourself time to trial and error with this stuff until you get it the way you want.
One tip is that for the first couple of days mine was a bit sluggish and battery hungry as things were getting settled.... now I usually have about 50% battery left at night (same as my 6s Plus).
Realize that this isn't a phone... its more or less an extension to your phone. Its early in its life, so some apps are crap and some are very good. If you get one that is crazy slow, or doesn't load well, then ditch it. You load a bunch of crap on your watch and it will be crap.
Some of the top things I do with mine:
- Notifications, particularly of messages. I have a hard time feeling the phone vibrate so the watch saves me on that.
- Telling the time... duh. I replaced a traditional watch, so that is a requirement.
- Telling the date... duh again. With my traditional watch, the date was always getting out of whack and I gave up trying to change it. Its always right on this.... as well as DLST being done automatically.
- Showing a different city time when I'm out of the country, or working on a global project... very useful.
- Messaging. This is a big one for me. I can tell if I need to reply without pulling out my phone. And a lot of replies I can do from the watch. You can modify the pre-configured list of quick replies, which I did to be more natural with the way I text.
- Audio controller is very nice. I use wired headphones on my iPhone when working outside, working out, traveling. I can now leave my phone in my pocket and change songs with the audio control glance. It works for other apps like Amazon, Netflix, etc.. to pause/play.
- Carrot weather is very good, as is the built in weather. I have different complications on different watch faces depending on if its a work day or off day.
- Work outs and running - these apps are a little weak compared to dedicated sports devices, but they work for me. I am just looking for a gross record of what days I do things, so works for me.
- Seeing next appointment on my watch face is convenient.
- Shazam from your watch is cool, and it will give you lyrics (scrolling for some songs). You can look like the boss singing to a song you don't know.
- I haven't used it yet, but will use the remote control for my iPhone camera at some point.
- Locate your iPhone feature saved me last night... was headed to bed and couldn't find my phone, so hit my watch and it dinged a few times and I quickly found it.
- Siri works very good on the watch, but you do have to have your mouth very close for it to work. One place I've used it a lot is when working outside and my playlist ends, with very dirty hands I don't want to pull out my phone or even touch my watch so I just ask Siri to play more music... works great. This is with wired headphones to my pocketed iPhone.
I keep experimenting with new stuff and tweaking my configuration and usage. I'm gravitating to have different watch faces and glances depending on what I'm doing that day. Work (business), yard work, gym, off day, traveling, etc... there are different sets of glances and complications I use for these different scenarios and it takes just a couple of minutes to change the configuration from the iPhone Apple Watch app.