I think I should do this every time this happens. Since I'm not 30 yet I don't do it for normals though, so I end up staying in queue and regretting it. I've done it a few times if u have lots of time and something else to do in those 5 minutes, but otherwise it doesn't work out for me.
After 2 brutal Games last night, both of which were after someone dodged and I thought I might get in to trouble (and both times really regretted staying in queue, the games were disastrous) I thought perhaps I should go teambuilder or blinds for a game if it happens (I normally play Draft). I see that this doesn't work in ranked but it's something to keep in mind for normals.