Back when I was single, or even married without a kid, planning things wasn’t necessary. I’d get an impromptu phone call from a friend and just say “sure, I’ll be right there!” Then I’d actually be right there, and we’d spend the next 11 hours sitting at a bar.
Nowadays, if I don’t have something on the books at least a week in advance, I can’t even answer that phone call. Just getting yourself and your kid out of the house takes an eternity. When you become a parent, the concept of “spur of the moment” ceases to exist.
Having children means the death of spontaneity.