Going from Toronto west, long. Driving through Ontario it's as if you're on a loop. "I swear I saw that tree and little lake a second ago". And it takes an unreasonably long time to get through. I liked the prairies, it seems to go way faster, big sky, interesting river valleys. The mountains are neat and then you're there!
Toronto east is absolute bullshit until you get to Quebec and then it starts getting interesting. I have very little experience driving beyond Quebec city. I've heard people say the roads in New Brunswick are comically bad.