SoberKnitter,
i counted days for my first few weeks, just because of the daily "wow!" factor. after that, i just moved on to weeks and months and...ja, years!
there is a woman i know who is entirely aware of her day-count every day, and signs off with signatures like "2752 days sober by choice", and that is about celebrating for her.
i can't imagine how it would harm her...
what i've seen quite frequently that looks like a possible set-up is the goal-setting of counting, things like "i want to get to 30/90/100/365 days". when i hear that, i tend to want to ask about day 31, 91, 101 and 366.
but that's just me; it seems like a "and then what??" thing.
but that's not so for everyone i've seen do it.
from what you say it sounds like something that enhances and re-inforces your positive feelings about your sober days.