re: Any of you married men with families ever quit your job without having another lined up?

negotiating leverage for salary is much different if you are employed vs not. Never a guarantee you find a better before COBRA insurance runs out even if you are in demand as they may only have part time positions in budget.
Always line up next and then give 2 weeks and finish your work before you leave, if you don't that lack of professionalism will come back on you when you need a reference one day