But other than popularity there's big differences. Both Superbowl and world cup are highly organized, highly commercial events, planned way in advance, where top athletes perform.
The Elfstedentocht always comes unexpectedly. When there is a cold snap in the weather, a fever starts brewing among the population. As ice grows thicker people from all walks of life start to get involved to organize the event. Pumping stations stop their operation to improve ice conditions, crossings are created on patches of bad ice where one walks with skates over land (called 'kluunen'), and all across the track people start to sell hot chocolate and soup. The event is a huge social happening, not just for the top athletes. The people that come last over the finish line or the ones that just did not make it within the set timeframes are as much heroes as the winner of the tour.
Elfstedentocht is very much an event by the people, not an entertainment provided for the people.