I might be hilariously wrong here, but isn’t fertilizer speeding up the process of farming by a lot? I seem to remember that plants grow a lot faster if you use fertilizer.
But anyways:
Farming has its purposes. Especially with a different playstyle than you suggested. There are some people who like to build bases, a safe haven, hell, some of my friends reclaim whole towns and fill them with people. In such a playstyle, farming would make sense - in fact, it would be necessary, especially if you have followers who need food. Also, if you look how farming works, it encourages the player to move out, to go on adventures or raids for stuff. Plants only grow when they are unloaded and reloaded after all - at least that’s how i remember it.
Even if you don’t plan to make a safe base, farming can help you - in the future, with a different character. A lot of people reuse the same world for several characters, and that’s where farming can shine, especially if everything around your farm is raided. A new character can take the food from the farm, even train cooking with it, and the follow in the footsteps of your old character.
That all being said: I don’t farm all that much either. I’m one of the players who basically make an enormous car and drive through the countryside. Every once in a while, when I enter a new part of the map, I do search for a good base of operations, reinforce the place and plant a few vegetables and fruits. This can be quite important if you have the more complex nutritional system, since you’re not always able to find fruits or vegetables. Of course, Flour, cornmeal and so on can also be relatively rare, especially if you have a low item spawnrate.