I agree with you on the peace of mind insurance brings, and arriving at least a day prior to the ABDs.
I think what a lot of people don't see (and I'm not aiming this at you
@calypso726) is that trip insurance isn't just for if you have to cancel out on your trip. It's also for if something happens to you while *on* your trip. I was on a cruise that stopped in Nassau, and did a Segway tour. One of the women on the tour fell off her Segway, and badly broke her ankle. She ended up hospitalized, and her husband had to get all their stuff off the ship because they were going to need to stay in Nassau until her ankle was stabilized enough for her to leave the hospital. She may have even needed surgery; we didn't get that level of information. So there's the cost of the remainder of the trip they didn't get to enjoy. His acommodations in Nassau while she was in the hospital. Her hospital bills. (Lots of people don't know that most health insurance will not cover you outside of the USA.) Getting a flight home from Nassau (or perhaps back to Ft. Lauderdale if they'd left a car there.) Or if worse had come to worst and she'd needed to be air lifted back to the states. All these things would most likely be covered by trip insurance. You *can* get just medical travel insurance if that's what you're worried about.
Also, I had just finished my Alaska ABD when I injured myself getting ready to head to the airport. I ended up in the emergency room, having a CAT scan and having staples put in my scalp. I missed my flight so I had to switch to a flight the next day and had to stay in Anchorage an extra night. It was all covered by my travel insurance. They dealt directly with the hospital, and I never even saw a bill (they paid as primary). While I was on the phone with them, they called Alaska Airlines and got me re-booked on the same flight the next morning. They paid for the new ticket. They then got me a room at a hotel near the airport, and paid directly for that. Totally worth every penny I paid for that insurance.
Sayhello