When the coronavirus shutdown began in March, Vanessa Antonelli and Jordan Epstein of Manalapan, N. J., rented a house in Orlando for a 10-day break with their 5-year-old daughter and 9-year-old son. “We quarantined and ended up staying three months,” said Ms. Antonelli, 38, an interior designer. “The pandemic made us re-evaluate the way we were living. It gave us the time to reflect.” In June,...