I am definitely at the very least borderline if not relatively mild/moderate case OCD. I don't count steps, but I do have to stare at lights and count to 5, 3 times, to be sure they are actually off. I also have to "lean" on the refrigerator doors for the same count (which is, BTW, a set pattern...1,2,3,4,5...1,2,3,4,5...(fast) then 1...2...3...4...5...(slower). I have to do this also with the front door, and if I am interrupted, then I have to start over. There are several things actually that need this attention. I can ask my husband if they are off, and he then "takes responsibility" and I am fine. But it takes me awhile to leave the house if it is just me.
It isn't easy to deal with, for sure.
I suppose the real problem would be if you have to go back and recount the steps if you stop, or if you get to the top and think you miscounted and have to count again. I am probably in this phase, though not with steps.