When I'm polled, I don't find it hard at all just to answer the question, without first trying to guess why I'm being asked it. I suppose it goes with being able to look at an unshuffled hand and not feeling the urge to attempt to reconstruct the play at the previous table. The bigger problem with polling is that often the only people who can be asked are those who have already played the hand, and therefore know what the outcome was. That's why TDs often start by asking each other - we often won't have seen the hand already, and we generally have a good idea, based on experience, of what other players do. I'm not sure that bidding competitions get untainted answers, though they may well be tainted in a different way.