Yes I plant my sweetcorn in blocks and the pollen is sprinkled liberally. The problem comes with the second or third cobs down the stem - by the time they need pollen the flowers have often run out, so while we get beautiful well-filled cobs for the first and sometimes second ones, the third ones have so far been a disappointment.
I have two different ages of plants too - sown at the same time but planted out a week or two apart so one lot is behind the other. The later ones might pollinate the third cobs on the early ones but then the later ones will still have the problem.....

I tried sprinkling collected pollen this morning but as there is still plenty being produced I was really just seeing how to do it and how much I will need to collect for the third cobs.
Sweetcorn is so delicious that it's worth all the faffle to be able to grow it up here on my draughty, windswept hill.