I... legitimately never noticed that! I guess it's because of how much importance I put into keeping a "safe" distance from enemies; if I get closer than the distance I'm used to, slowly at that, it only means they would easily be able to get at "hugging distance" if they detect me.
It did, after all, take me a really long time to notice that "hiding" worked on every enemy (which, I must add, made the game WAY more interesting once I started using it); I spent a long portion of the game thinking hiding was only used to hide from the facey-mc-face thingies. The first time I tried it against a "physical" enemy, I came to the conclusion that it didn't work on them when I saw that they were still headed towards the dumpster...
By the way, another thing I noticed: I have really no idea what triggers this, but from times to times, using C to look around no longer slows down time. On my first playthrough, this happened very rarely, and I think, if I recall correctly, was only happening on a look-around per look-around basis? (i.e. it would happen once, then you'd look around again, and time would be slowed down as normal again?)
I'm on a new playthrough on the "madness" difficulty (though it could be caused by v1.0.3 instead?), and this time, it's happening way more frequently, and once it happens, it stays like this for the rest of the session (until I go back to the main menu). You can easily detect this by holding shift before looking around, and looking at the speed at which your character tippy-taps.
It's... not actually something that's "that" bad... sometimes, you want to wait for things to happen at a distance (like enemies moving out of the way). Maybe use "shift" as a way to control whether or not time is slowed down when looking around? Doing this could also solve this very issue; if it happens, one would just need to toggle the slow down off and back on again to re-force it on?