Yeah, sometimes we just get a huge influx of posts in the moderation panel (avatar requests - we spend a little more time with those of course, journals, spill your guts, etc... they all get submitted at the same time it seems!), so the queue just gets backed up. I can approve everything in one click but sometimes there is spam and other crap that has to be weeded out first. We don't get a notification saying that there are new things in the queue, we have to manually check that and sometimes I am just lazy, haha!
If you've submitted a post for approval, you don't need to send it again - it will be in the queue and someone will approve it within a couple of days at the most.