I'm old and senile so my number things are more simple but I still have them. I have a thing with the number '4'. Say I'm drinking a soda. I almost always take 4 sips at a time. I'm almost a bit neurotic about it.
I also normally count my steps but I think that is due to my being blind in one which, long ago, made me think about losing the other. Elevator to my apartment door is 28 steps.

I've actually experimented by closing my eyes when getting off the elevator and seeing how I'd do getting my place including finding my proper key and opening the door. Felt sort of weird but I did it without much hassle.