Bahaha the mccrepe does hold a special place in my heart (probably literally with all that cholesterol oof). But when you're not looking for a quick meal, like when you're in the mood for a sit-down breakfast or even brunch, where would you head?
Péché Matinal in Longueuil is my go-to. There's always a line up, so plan accordingly!
Their "Poutine Déj" is excellent, and served in a cast iron skillet so it stays warm the whole meal.
It's slightly off the island unfortunately, but you can easily get there by metroing to the Longueuil - Université de Sherbrooke station and walking there.
Eggspectation on De Maisonneuve would be my second go-to.