I spent my first year slaving myself on watering plants, literally spent my whole first summer days just watering the farm (that's what I get for chewing more that I could bite, or in this case planting more I could water), then after that I spent the second half of my 1st fall and most of my 1st winter on mines I came back with a lot of iron, gold and quartz. After inspecting the items I could craft out of curiosity I discovered that I can craft Sprinklers and even better than that: Quality Sprinklers, crafted many Quality Sprinkles + 1 I got from community center bundles and now I can spend more time on trying to get animals / fishing, etc. I'm currently on my 2nd year but BOY how game changing Sprinklers are, I may find a better moment to be proud in the future because I'm still on my first farm but for now that's what I'm pround the most. My self watering plants.
TL;DR: My Quality Sprinklers / self watering plants for now