Ehm last year, it was pretty busy but, not like overcrowded.
Djurs Sommerland is a park with big open fields and has allot of places where you just can sit and relax, i also think that! has something to do with the crowdness. it's not like Tivoli Gardens where you can only barely slip throug the crowds, because of the "small streets". where you like touchning each other!
Thats what i also like with these Summelands it's big and open, like you are almost in a forrest! just with some big open areas.
But at all the time i have been there, there have been max an 30 hour wait for Piraten, but mostly like 10-15 minutes.