I've been doing quite a bit of dinghy cruising this year. So much so that I haven't had much time to write about it, sorry.
I've gotten my packing routine down to the point where I feel it's getting quite efficient. I always bring the same items and store them in the same place for every trip. A little organization goes a long way when it comes time to find something. I try to bring only what I need, and use items for multiple purposes whenever possible. I only bring extras of items that are crucial.
It really bugs me to have things out where I have to walk on or around them, so I store everything in the lockers and under the thwarts and side decks. Once everything is packed away, it looks like I'm not bringing anything at all. That's not easy to do in an open boat.
Here is the packing list that I use. This first page shows where on the boat I store everything. Many of the items are stored in bags. I use soft-sided cooler bags for food and water, duffel bags and backpacks for clothing, and dry bags for electronics. Page 2 shows the contents of each bag.
Most of this stuff stays on the boat permanently. Usually all I have to pack for a trip is food and clothes.