Basic question about CI - lucidity of files

[eluser]4ever[/eluser]
HI,
I started to learn CI with help of some video tutorials. However the programming I see of author seems to me a little chaotic. I can't imagine that. I would made a great site with many forms, actions for sending them, searching scripts, etc and all this things I would place to just three folders: application/controllers,application/models,application/views ... so that would be really chaotic. So I ask you can you build subdirectories to assort the files according its purpose?

For example:
application/controllers/forms/all my forms here...
application/models/form_send/all my form actions here...
application/models/search/models to search in database
application/views/forms/forms views here
application/views/pages/view of separated pages on my site
application/views/profiles/profiles of users here
application/views/posts/users posts views here

or do you just mix all files together?