Jews just don’t go to keverim in order to “get something”, they also go in order to “give” simcha to the tzaddik. It might sound weird to some, but there are many Jews in Israel that feel a strong connection to R’ Shimon as if he was their actual physically-living rebbe/rabbi.
Either way, I know of a huge Breslov rabbi of the previous generation that agreed with your last statement & so he stayed in Israel for Rosh Hashanah. However after witnessing so many miracles that kept taking place for those that went to Uman on R”H, he decided to start going himself.