I also agree that most apps are not worthwhile. The ones I use as a complication or glance are great and load very fast. However, what is that, 8 or so good apps out of thousands?
I don't know... that probably works out to the same ratio of good to bad apps for the iPhone as well
I do like the apps I use daily and love the speed and usage. Carrot, Fantastical, HeartWatch, WF, Drafts, Things and a few others are really good.
Carrot Weather and Fantastical Calendar are my two most frequently used apps, and both have been fast and reliable. I was new to both of these apps after buying the Apple Watch in July. I chose Fantastical because my previous calendar app did not offer a watch app. I tried going back to the native Apple calendar, but didn't care for it. I tried Fantastical after reading reviews and it has been excellent. I tried Carrot Weather again because my previous weather app or iOS did not offer a watch app. First I tried Dark Sky, but they had some issues with their Watch app initially. I think those issues have been resolved, but Carrot has been so good that I haven't had any reason to switch to something else. Both of these apps represent the best in watch apps in my opinion: They load quickly and reliably, appear to have watch apps designed by people who actually wear the watch, and offer many options for large and small complications.
Things used to be my favorite task list app, but I switched to Swipes because I wanted something I could access from my iPhone and from my Windows desktop at work (it has a browser based app). The Swipes watch app is fine, but not as nice as what Things and 2Do offer. I gave the Things complication a try since I still have the app and it is nice to have.
The other apps I use daily (or almost daily) include: Due (Reminder app that I usually interact with on the watch via notifications), Activity Rings, the Now Playing glance for music, Bring (grocery list). I
should be using Lose-It more consistently than I do. It has a complication that works well at providing feedback on your daily calorie budget. Bring is the only app giving me grief lately. It doesn't update as reliably as it once did ever since this latest watch OS update. Before that it just worked. I have reinstalled and reported the issue to the developer, so hopefully that will be resolved soon.
I believe all of these apps are great examples of why I am glad Apple has allowed third party apps from the beginning. Apps I use less frequently but have found to be useful on the watch include: Cloud Outliner, Evernote, OneNote, Slack, Yammer, Mint, Yelp, Hue (lights), Tide Graph, and a few others. Some things, like travel apps, I would use only as needed... but it's nice to have them.
I do have apps on my iPhone that offer watch apps that I have chosen not to install (or that I installed and later removed because I decided it wasn't needed on the watch). I don't really desire to have entertainment apps or games on the watch, although some might. I did try putting a few news apps and readers on the watch, but decided that if I have time to read a few headlines I might as well get my iPhone out. If the watch is to be a platform for quickly accessing brief snippets of information in the most convenient way possible, it helps to keep the clutter at a minimum. There are first tier apps that deserve space on the watch face via complications, my 2nd tier that get a Glance, 3rd tier are installed but accessed only as needed from the app screen or via Siri or notifications.
Sean