I've found that many people get frustrated over the "I don't know how to put into words how they have affected our lives" aspect. I suggest thinking about the entry analytically.
Read old entries, and study the trends. Follow the criteria in the manual. Once you're done with that part, the area that comes from the heart becomes much more manageable.
There is no need for the past winners to talk about how awesome it is, everyone besides the rookies should already know. 20% response either means that the FIRST Community is "voting with their feet" (aka, showing their opinion about their award by not submitting an entry), or they're making excuses. And honestly, with how high the award is held by everyone involved, the first option isn't even valid.
If you have the time to be caught up on Delphi and the Q&A forum, then you have time to go write a WFA entry. Get it read by multiple sources (I would also be willing to read to make sure you're getting the most out of your entry and best highlighting all of your mentor's hard work), and then just send it in.
No more excuses. Go! Write! Now!
PS - Dear FIRST, I would love to see a WFA parade.