Oh. I though that considerations went away automatically if the voting indicated such. I guess I miss the point of the voting mechanism.

As far as I understand, the only automatic consequences of voting are reaping. For all other cases, the voting ballot shows the intervening janitor what other monks think about the consideration. See How do I use the power of consideration responsibly?: Consideration amounts to a suggestion that janitors "fix" something.

Really? I though I vaguely remembered that there were some specific consequences of consideration. Visibility?

Afaict only approval, front paging and reaping affect visibility, not a consideration as such.