Abraham obeyed God when he went to sacrifice his only son after God requested it. Would we make a big gesture like this, to prove our devotion?
I don't think this is an ordinary situation, so I would doubt your sanity if you were to try to replicate this event today. Big gestures are easy anyway. Or easier.
Giving your life to save someone else is fast and simple, even if it is a huge thing. How much harder to obey God over the course of an entire life though? How hard it is to obey when He says to love your neighbour, or not to covet!
Easier to give your life in a moment (when heaven awaits) than to struggle with obedience for 50+ years of a Christian life.