So rather than scenes, I've divided my story into conflicts, and briefly written what happens within these conflicts/chapters. Some chapters are shorter than others; some may merge into one. I hope a couple of chapters will expand into several as I figure out further plot points.
The other thing I'm doing is summarising each paragraph or set of dialogue into one sentence. This has been really useful as it's shown me where I'm repeating myself; where I need to devote more time to a subject; or simply where I'm not saying anything worth saying.
After this, I'm going to write a synopsis of my story the way I want it to be. Mentally, I've already cut two scenes and added two others which will help the characters' motivations for acting the way they do, later on.
Then I can start the rewrite.
I really like this new sum-every-paragraph-up-in-a-sentence technique; it clarifies whether the paragraph needs to be there.
I want to start rewriting, anyway. I'm sick of trying to re-structure and re-plan everything; it feels like I should start doing. Once I do start writing again, I'll still keep the new structure very much in mind; but after I've done this synopsis, I'm going to start writing the actual story again.
I already know what my problem will be with my (new) first scene... but that's a problem for another day.