Early spring vines at Millbrook Vineyards and Winery, ready to do their thing. During the steep drive up to Millbrook Vineyards & Winery, in some spots the only thing you can see are rows of grapevines stretching to the horizon. The effect can be both eerie and disorienting — wasn’t I driving through the Hudson Valley a minute ago? — especially on a drizzly, raw April day when there’s not a soul, or leaf, in sight. Looks can be deceiving. Inside the beamed winery — a converted dairy barn — is the clamor and hum of machinery. It’s bottling day…