Google Apps (service): What's a good add-on for Google docs to make file management more intuitive?

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It integrates with Google Apps. It's paid but has quite the following with some very intuitive features.  They even have a great ipad app.

Another thing you can do is stick with the core Google Docs interface and help your users adjust with one on one QA sessions and on demand training you can develop for the difficulties that come up the most.

It's nice to be able to adopt add-ons to make things easier for people but from experiece, you are always going to get complaints about the systems you use.  Doesn't matter what you use, there will be some that don't like it. Most of the problems your users are having may be easily handled with a little training on how to do things.  Google Docs is a free system for up to 50 users.  After that, it's 4.16 per user per month (actually 50 per user per year -same thing). 

In the past 5 years, google docs has grown into a major contender for office software.  New features are added weekly now. The features most Add-ons offer will eventually become native to Google docs.  Probably sooner than later. I've stuck with the core Apps from the beginning and I'm impressed at how much time and money they've saved my clients.

Whenever there's a problem with a Google Apps system, or an obvious feature is missing, I tell the users that the best engineers in the world are working on it. And they are.

If you use Microsoft Office, the Google Docs team just released an addon for the when you save them locally PC version of Office that saves and syncs your Office documents directly to Google Docs. It's a great way to help transition users into the cloud.  http://tools.google.com/dlpage/c...