I just started using Scrivener again after not writing anything for months. Funny how some time away can make things fresh. When I first got it, I couldn't "see" how some of the features would work for me. Now I'm really getting into it beyond the basic "writing things in chunks" concept. Doing as much as possible from within Scrivener (importing research docs, attaching files) helps keep me "attached" to what I'm writing, making it less likely that I'll get swept off on a tangent.
My original concept started falling apart so I'm reworking it and starting over. Now I'm trying to make myself get in the habit of using tags and labels NOW before I have too much stuff in the project.