We have belonged to Harvest Hosts for at least 7 years and love it. When visiting a winery, you pull in, chat with the owners, maybe sip some wine and they go home. And there you are, parked in vineyards, pretty nice!
There are sites that are not wineries such at French Cheese Company in Tillamook, Oregon. We even had a winery in Paso Robles, CA asked if we wanted to plug in!
And if you refer someone who signs up, you each receive an extra month added to your membership!
I would say, try it for a year and see if it works for you!