Do index cards work?

As I am nearing the end of editing, I am trying to see if the index card thing has helped. Cetainly I think this ms is a stronger one.

Obviously, the proof will come when revisions hit. Did I make a mistake with the structure? Etc etc. If you compare the top picture of the board with the bottom. You will see that I now have far more yellow cards -- ie things progressing the relationship, rather than external things. A number of scenes ended up being cut as they did not really help. So this is good. I was also able to see holes more easily. All in all, I can see why index cards and boards are used. I think they can be a valuable tool. I know that I will keep the cards until the revisions are completed, just in case things need to change. And I do think colour coding has helped.

And I rather suspect that had I done this with my Viking, I would not have had to rewrite the thing and would have spotted the major flaws...Currently I am wondering IF the Viking will be returning for more tweaks...it happens when one does major rewrites.

Upcoming workshop and editing plan

Next Friday -- 10 October, I will be going up to Berwick upon Tweed to give a two hour workshop on writing romance as part of the National Year of Reading. Apparently the ticket sales are going well. So I guess it won't be just the librarian, my daughter and I...
Anyway, I am looking forward to it, but also feel a bit like I have just emerged blinking into the sun after doing my revisions (or more accurately rewrite)
I have also started revising/editing my Governess one. I am going to try to be methodical about this one. I am tempted to get a Story Board and a stack of index cards. Is this a procrastination technique or merely a reaction to not having seen a huge hole before I submitted the Viking?
Or will I get the cards, decide that it is too much like hard work and go back to the method that works for me? Because my books tend to be about 15/16 chapters long, it should in theory be easy to divide the board up my way.
Several of the big flaws with the Viking -- were the hero/heroine leads, and the laying of way too much pipe. In other words I over complicated the back story and made the main characters react to events rather than cause them. Characters in a book make their lives happen. Would I have realised this with index cards?
I know that such measure are not good when I am writing the first draft. There is really very little that can come between a writer and the blank page. Writers eventually have to write. But after that, lots of things can be done. I figure that I might as well give it a go. I know several writers who swear by such measures.
In other news:
The honey has been harvested -- 22 pounds. It was a poor year. The beehives now have to be made ready for winter -- with mouse guards and the annual treatment for varrora.
The pumpkins are about ready to be harvested as are the tomatillos. Tomatillos are green tomato like fruit that are used in making green chile sauce. They are very sharp in flavour and very easy to grow. The chile crop is decent this year but again because of the lack of light, the plants did not fruit as well.
And I have started to have fires in my new fireplace. Instead of having blue hands as I type, the fire now crackles merrily. Of this could lead to procrastination -- stirring the coals, putting more fuel on, burning index cards etc etc.