I've had insurance from Arbor (Blue Cross) pre-ACA, from Erin's job at the Latin School (Blue Cross) pre-ACA, from Matasano (United), from BCBS on the ACA marketplace (and now at Fly, but that doesn't matter b/c...) and ambulance trips in all 4 of those, and all of them cost a fortune.
Later
Erin also points out that beyond the deductible cost, your ambulance has to be in-network, or it's not covered at all --- that bit our family too.
I'm a defender of our insurance system, weird as that sounds, but even I won't try to stick up for how we handle ambulances.