It didn't just affect games, but also real life for me.
Ever since I had become a mapper, I've been obsessed with analysing tne designs of things around me. I take photos of things, I want to know how those things were made, I want to model those things.
In my school's basement, I was looking at how the pipes were placed. Every pipe goes in its own direction, but as if it were the result of good cable management. One of my classmates asked me "Admer, what are you looking at?" and I responded "I'm looking at the pipes, what do you think I'm doing?", and she laughed. Of course, I only do the analysis when I have nothing else to do, or when I'm just bored.
So yeah, when I play games, I tend to observe the design more than enjoying the actual game. Interestingly, that has proven just as fun as playing the game like other people.
Therefore, mapping did not ruin games for me. I just look at them from a different perspective which I enjoy as much as the other one.