I confess to having a shoebox full of scorecards. Two cards for each course, one clean and one with my best score. I've recently started to add the yardage books when available.
I also collect bag tags from courses I've played. (No, I don't have them all hanging on my bag.) I did have them displayed in my office, hanging from a flagstick mounted to the wall. When we moved 12 years ago, I took them down and now they are in boxes.
I also maintain a database of Arizona golf courses. I noticed that all the different published ones were incomplete or with errors, so I created my own. I get excited when I find out about a new course and get to add it to my list.
On the course however, I'm perfectly normal.
Tom