How traditional Judaism looks at visiting kevarim
Well, people go to the graves to pray for yeshuah of various sorts, do השטתחות to be זוכה לעיבור נשמה etc...Breslovers believe that the only way to be בן עולם הבא is to say תיקון כללי on their rebbe's grave. Lubavitcher Rebbe used to go regularly to the frierdiker's grave with a briefcase full of papers.
The midrash tells us that Yehoshua and Kalev went to pray on the graves of the Avos and were saved from עצת מרגלים.
Judaism is a wide tent, looks like.