1. No "Virtual Queue" option. I get that Europa Park prides themselves on capacity and their queues are some of the fastest I've ever stood in with some of the best operations, but having said that, just about everyone in our group would have been willing to spend 50EUR each to not have to wait 35 minutes for Blue Fire or Silver Star every time they wanted to ride. And the reality is they probably would be out spending money on some of the amazing food while they wait!
I think here and Phantasialand are 2 of the highest parks on my bucket-list to go do even maybe edging out a Florida trip by a margin. For us, now our son was just born, it probably would be once in a lifetime for Florida (as in 10 year saving plan) and the downside of being a teacher in Asia is the only time off falls in the avoid like the plague weeks for theme parks (1 week end of July and another Christmas & New year week). Plus, airplane tickets go sky-high since nearly the whole country has that time for vacation and on our budget it would be a v cheap hotel so fast pass + might work against us. That's not a dig at Disney since that's our own personal situation but what I mean is if Europa Park ever installed this it would leap over all the other parks on my list by a considerably huge margin as the place to save for.