it is definitely out there if you just consider many artists over the last 20 years who seemed highly influenced by them (Savatage, Bend Sinister, Lady Gaga, My Chemical Romance, Apes and Androids, sElf)
Also you consider their songs in pop-culture, even since Wayne’s World. From the Muppets version of Bohemian Rhapsody to this video that just was put up this past week