Oh please- there were numerous photo-ops for all of them .(I remember watching Chretien holding a sand-bag to 'help" with the Winnipeg flood of 1997. He was there- took the picture and left- in the space of a blink) .
Difference is the amount of media coverage now.
Harper had the famous "24/7" coverage of his everyday activities- as well as the usual press coverage. They all do it.