Michal Furey loved Gretta so much that he, a (probably) tubercular worker in a potentially carcinogenic workplace (the gasworks) risked his already fragile health to come stand in her back garden in a cold rain. He is so desperate to see Gretta before she leaves that he says "...he did not want to live." Gretta believes that he died for her, and it may well be the case. There is no mention of whether or not he wore galoshes, but if he did it didn't save him. He died a week after that last time he saw Gretta.
Gabriel, however, is fond of the newfangled galoshes, and he is careful about his and his wife's health. Unlike Michael Furey, Gabriel seems to relish being alive. He is in love with his wife, but he also does not seem to harbor romantic notions about her. "He did not like to say even to himself that her face was no longer beautiful but he knew that it was no longer the face for which Michael Furey had braved death."
It's hard to imagine Gabriel Conroy braving death for...
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