I've beat a game and been close enough to the platinum that even though I feel like I'm done with the game, I'll just suck it up and finish the list. Doesn't happen too often though, I have to be enjoying the game. Conversely, if it's a game that I love like Bloodborne, I knew right from the start that I wanted to get the platinum.
On the other side of the coin, I am perfectly fine with Nintendo not bothering with trophies.
It's funny because bloodborne is a game that I played staunch and had an amazing time with but didnt get anywhere near the platinum. Last year I decided to replay it because the digital game was on sale for super cheap and I never played it before. At that point I decided to try to platinum it since I knew what I was getting myself into.