I never ever ride faders during session, though I do sometimes tweak it down if it shows to be way hotter than expected to begin with and will give a more sustained dist on several occasions during the take. In that case, often due to very spontaneous actors (which may be ever worse for your ears...), the take is ruined anyway so I might as well make the best possible of whats left of it.
In the Dark Ages (IE when DAT was something positive), it was often a real challenge to keep the voices above noisefloor but below hard clipping on dynamic actors, often including heavy compression which I've never really liked during recording anyway, but as we do have sweet sweet 24bit nowadays, it's MUCH better to keep it lower rather than higher and keep everything absolutely clean! Everything one can do during recording, can be made in post, with the difference that you can undo it there. Except keeping the material in focus, or anything else related to micking techniques, of course :-)