@danxox There are a couple of instances where it might be worthwhile. You could use it for rrsps, then use the tax refund to pay some of it off, and your regular rrsp contributions to pay the rest down. It lets you move up your contributions, effectively. Whether that actually works out mathematically depends on the exact numbers.
Also helps with, say, a bonus (my situation) that you'd want to put into rrsps. Since a bonus is taxed first, you can't put the whole bonus in rrsps. So you borrow from the loc to match the taxes, and then pay it off with the refund.