When reciting my score, I just follow the convention used by the person I am talking to. For example, virtually all of my serious dg friends recite scores with the assumption that every hole is considered a par 3, so if someone in that group asks me, I will do the same. On the other hand, I have a bunch of casual friends who go by listed par, so I will either tell them my score in terms of listed par or will just tell them the number of throws if I don't remember what the listed par is.
When I keep track of it in my head, I do par 3's. That way, I can just multiply the number of holes by 3 and add/subtract the amount over/under I am without having to go back and think of how many par 4's or 5's there are, especially since this number can fluctuate with summer/winter basket changes, etc. It just makes everything simpler, and I don't really take par to mean anything more. I won't get upset with myself over a bogey on a 900ft hole, just as I won't feel satisfied with a par on a 150ft hole.
As has been stated, it really doesn't matter. The par doesn't matter. What matters is how well your fared on the hole compared to the field, your friends, or your personal averages.