Yep, I have a similar experience. I was using Wunderlist this way. However, now, I use Siri on the watch to add stuff to my reminders app (Grocerly List). I have an app on the watch called Reminders Nano that I use to just check them off at the store. Works much better than holding the phone while I do my shopping and having to track down the phone to update the list.You are generalizing because you haven't found apps that are convenient enough for you on the watch. That is not the case for many of us. Not only do many of my apps load just as quickly on the watch (or at least as quickly as it takes me to find my iPhone and load the app), but you are dismissing a very real convenience factor. Here is but one example:
I go to the grocery store three or four times a week and use a grocery shopping watch app called Bring. I don't have it as a complication or a glance, because I only need to open it when I am at the store. I launch it from the app screen when I arrive and I tap my watch to cross items off as I shop. I don't need to walk around the store looking at my iPhone over and over. The iPhone stays in my pocket freeing my hands to push the cart, wrangle my kids and do the shopping. I simply glance at my wrist and the app shows me what's next (I have my watch set to show last app on wake). I get all the shopping done, and use Apple Pay at the register, without getting out my iPhone or my wallet. That may or may not be a convenience you need in your life, but it definitely makes trips to the grocery store much better for me.
Sean
In other words, there are apps that aren't useless.