I've come across a view bugs with this hack so far. The first is, if you have the pollid and the the poll is set to hidden but is a public poll, you can see everyone who voted and thus can tell what the results are even though the actual number is obscured.
The second one is a bit more interesting:
If you mouse over the poll, you get the reverse order of the results. So Yes in that poll has zero votes (so the bar extends to the end), No has 11 of 14 (and therefore is the shortest) and abstain has 3 votes and therefore is the second shortest. It's not exact but it gives you sufficient information to tell whose winning, how close someone is being second, etc.