This mystery is less about physical suffering (though that is most definitely a factor) than it is about what I think of as perfect humility.
Humility has two aspects. The first aspect is more basic: Seeing yourself as God sees you. (Easier said than done, sure, but still very positive.) The second aspect requires much more supernatural grace: Remaining in virtue when others do not treat you as your God-given dignity deserves. Everything about the Crowning with Thorns smacks of this perfect humility. He was God, for goodness' sake! And here he was being treated like a common miscreant! On top of that, they were mocking His Kingship - a kingship of which He was very aware especially during His passion.
Lord, remind me not to get upset and snap back when others fail to give me the respect I deserve. Teach me how to just take it like You did. Teach me how to let myself be walked all over - and more importantly, when it would be beneficial to do so.
And help me to embrace the crown of thorns You've set aside for me throughout my life.