I have one but am still a beginner at using it. I am vegetarian but I've made rice, quinoa, sweet potatoes and steamed cauliflower in it.
My favorite thing is one pot pasta with vegan meatballs (Gardein brand) and chopped veggies. All in one pot! Only one pot to clean!
I'm also vegetarian and my favorite use for my instant pot is to cook dried beans. So much quicker and easier than on the stove top and it saves me so much money over buying canned beans. I cooked a 2-lb bag of dried great northern beans today and it took 20 minutes at pressure plus maybe 10-15 minutes to natural release. Made the equivalent of 8 cans of beans, maybe a little more, for less than $2. I've used it for chickpeas, black beans, pinto beans, roman beans, lentils, and even made split pea soup in it. I just use the booklet it came with for cooking times. Aldi has really good prices on dried beans. Usually less than $2 for a 2-lb bag, and they pretty much always have black beans, pinto beans, great northern beans, and red kidney beans, at least at my Aldi. When they're in stock, 1-lb bags of lentils and split peas are $0.99. I even got 1-lb bags of chickpeas for $0.40 on special! The 1-lb bags generally make approximately 4 cans worth.
I also use it to cook grains (quinoa, brown rice, wild rice, etc.) and steam veggies. Makes great sweet potatoes and beets.
What I love most about using it for grains and beans is that you basically set it and forget it until it's done. Sometimes total cooking time (coming up to pressure, cooking at pressure, natural pressure release) doesn't necessarily save time, but I can set the minutes needed at pressure and go about my business without worrying about it. And there is a manual pressure release valve if you need to speed things along after it finishes the timer rather than wait for natural pressure release.
I'll cook up a batch of beans and/or grains once a week and then use them in various recipes throughout the week. I haven't really done much cooking in the way of entire meals using it, mostly used it to make components of a meal.