Today Rosh Chodesh Sivan is the day we arrived at Mount Sinai – Rashi teaches we were like one person with one heart. I think that is the meaning of the phrase in “Dayaynu” had we arrived at Sinai and not been given the Torah – it would have been enough. We would have had complete unity – that would have given us spiritual meaning.
Of course, we learn in retrospect, that was the preparation for receiving the Torah.
The Magen Avraham cites the Arizal that we must accept the mitzvah of loving others as themselves before we start praying in the morning. (It would be a good idea if we did this before driving as well!)
Rebbe Chayim Yisroel Morgensztern the third rebbe of Kotzk – known as the Rebbe of Pilov (1840–1905), author of Shalom Yerushalayim. Taught (end of Siman vav) that before one can move to Israel and once there, one must constantly accept upon oneself the mitzvah of loving others as themselves. If Sinat chinam (groundless hatred) destroyed the Temple – to move to Israel and be a part of the redemption, we need to fix that hatred.