I just got back from a week-long trip to Naples, FL and used packing cubes. I had tried them many years ago but did not like them and never used them after that. However, I finally figured out that it was because I was not packing them correctly.
So this time I read all the posts here, then went to YouTube to look at videos of how to pack them - and that made all the difference. I packed the clothing like they did and everything was organized and easy to find. Seriously, I've gone on trips in the past where I didn't wear clothes because they were buried at the bottom of the suitcase the whole time! And when I was ready to leave, I repacked everything the same way, and it was easy to organize them in my drawers and closet when I got home.
I had bought the Rick Steves packing cubes (the 3 pc set) for this trip and used it with my Travelpro 21" Maxlite 5 spinner but bought a set of slim packing cubes that I will use for an upcoming trip to my niece's wedding in March. That way I'll know what I like best in time for my month-long Germany trip the end of April.
So thanks to everyone for all your knowledge about packing cubes! You have made a convert out of me.