I honestly can't think of a game I've wanted to keep playing after getting the Platinum. I may have played a few online matches in Titanfall 2 but I'm not even 100% sure of that. As for God of War, it's a great game and should definitely be purchased new to show support for single-player games but the collectible hunt burned me out. I left a few things undone for 100% but I had had enough of the game by the time the Plat popped.
For me, the Telltale games would probably qualify under that category. Most of their plats can be unlocked in a single playthrough, but I usually give them another run doing complete opposite actions, just for funsies. As for God of War, it's been a month since I completed it and I still find myself missing the gameplay, characters, and listening to Mimir's tales.
How are you enjoying Detroit? My copy is stuck in transit somewhere and won't be delivered until after Memorial Day.