Moderators are here to perform actions that the normal community cannot.
If a question is fairly new and / or has 3-4 close votes on it, odds are that the community will take care of that question without our intervention. In those cases, there is no need to flag to ask us to step in. If possible, we prefer for the community to handle closing / reopening of questions. Among other things, this works against the "evil cabal of moderators are ruining the site" notion we see every now and then.
There are still many cases where flagging a question is appropriate as a 3000+ rep user. If there is something bizarre going on, vandalism, spam, trolling, abusive behavior, or something else that needs urgent attention, that's all stuff we'll want to take a look at. For closing of questions, it's fine to flag an old, neglected question that needs to be closed but will never gather sufficient votes to do so. Additionally, if you really feel that a question should be migrated to a site that's not listed in the standard close reasons, you can use a flag for that.
In the past when 3000+ rep users had voted to close, then flagged a question for closing, we often would mark those flags as helpful because they did indeed have a kernel of truth to them. However, we have a few users now who are clearly farming flags by flagging things that are well on their way to being closed or are already closed. These flags are distracting from the more important issues we need to deal with, so I and others will start declining them.
Again, if there's an old question that needs action and will never see the number of close votes required, it's fine to flag for that or any of the other cases I listed above. We simply don't need to be flagged about questions that will be handled without us.