I would venture to say a big reason people are aware of a paper towel issue and can even talk about it to begin with (knowing about Kitniyos in paper towels) is because increased awareness was bought about to the masses solely because of the book.
After widespread use of the book began kashrus agencies and local Rabbonim looked into certain matters more deeply and while sometimes they felt Rabbi Blumenkrantz was Machmir or disagreed with his Psak they always maintained respect for him.
Additionally,prior to Rabbi Blumenkrantz many Kashrus agencies would put out only brief lists regarding products, usually would not fully explain reasons why something was or could not be approved, and they would add in only a smattering about dinim for pesach.
Every major Kashrus agency guide over the last 10-15 years has become much more informative and comprehensive.I am sure this was in large part due to them seeing the tremendous benefits the Blumenkrantz guide was providing to the community.
I have tremendous Hakaras Tov to Rabbi Blumenkrantz ZTL for the book.