Too big? No such thing. We currently have a quarter acre in town and are looking to purchase 5+ acres within the next few years. It takes about 10 minutes to mow the one remaining patch of grass in our backyard. When we moved in 4 years ago, it was all lawn. The grass had to go. I needed room for trees, shrubs, a vegetable garden, raspberries, blueberries, grapes, kiwi vines, flowers, a stock tank 'pond,' a fountain, a patio with seat wall, gravel paths, chicken coop, compost bin, etc.
And I have to disagree regarding so-called 'decorative plants.' Blooming plants provide food and habitat for pollinators, birds and other wildlife. We have lots of birds, bees, beneficial insects, garter snakes, frogs, and other creatures that find a home in our yard. Beauty is nothing to scoff at either. I sit in my garden and look at the green things around me, listen to the birds, watch my goofy chickens scratching around, observe the growth and seasonal changes... and I don't think about my stressful job or all the terrible things happening in the world. A yard can be a respite and a place to relax and recharge as well as do the physical work humans were intended to do. There are many known benefits to the human body and mind from spending time in nature.
In short, yard =/= grass. There are far more possibilities.