Rav Yissochor Dov of Belz zy”a said, “A Yid must be moser nefesh to come to Belz to hear the words of Akdamus on Shavuos: ‘Zakain kad shimasun shevach da shirsa kevi’im ken tihavan b’hanhu chavrusah.’ (If we merit to hear this shira, we will also merit to dwell with chaburos of these tzadikim.)”
He added that when these words of Akdamus are recited, he uplifts everyone in his generation to a lofty level.