I haven't made the move from city to country, but we have made the leap from 100% of our income to 50% of our income. We took a big income drop 8 years ago when we decided to have a full-time stay at home parent.
As other posters have mentioned, with a big lifestyle change comes opportunity to do things differently. We no longer have my full time income, but we also don't have my commuting costs, wardrobe costs, drycleaning costs, eating-lunch-at-work costs and other less obvious costs have gone down; I am home so I cook more = less processed foods and less prepackaged foods, I am home so I have more time to plan shopping trips = shopping on sale, shopping less often and spending less, no cleaning lady (still really miss her though :-/), cheaper car insurance (no one drives to work). Since one person is home all week, we don't have to spend weekends running errands and doing chores (except for laundry - THANKS to TOU!) so we have time to relax and recharge.
Our quality of life is the same if not better than it was 8 years ago, so it all works out for the best.