I want to see all my folders, online or -off, in OSX Finder.

I'm having basically the same issue. I installed Dropbox on my new Mac. At that time, I selected a subset of the overall folders I needed to actually sync because I didn't want my computer attempting a large sync right then. Now, I need to get some larger folders for a project, but I don't see anywhere I can initiate that from the desktop app. It only sees the folders I synced initially and there's no UI element to let me select others. The UI action is to right-click the items to change the setting, but these files haven't yet been pulled to my local machine yet, so there's nothing to select.

I figured that would be OK, because I could just go to dropbox.com and surely there would be an option there to start syncing those folders locally...but no, there isn't:( I mean, it's fine that the desktop app isn't readily aware of all folders I might have in the cloud, but it's not fine that I can't push those files from the cloud onto my desktop in the dropbox folder structure. I can download files from the web app, but I don't want to download them to an arbitrary location, I want them to be downloaded into my dropbox and to start syncing from this machine when I make changes.

Here's the flow:

After installation of the desktop on my Mac I can see:
dropbox/folder 1/filesAndFolders.stuff

dropbox/folder 2/filesAndFolders.stuff

The folders in question are 2 folders down from my dropbox root, so now, I want to start syncing:
dropbox/folder 3/subfolder 1/filesIWant.stuff

But I can't even see folder 3 in the desktop app to configure it. Even if I could, I don't want everything in folder 3, I just want subfolder 1. My only option is to right-click on the root dropbox folder, sync ALL OF IT, then select everything I DIDN'T WANT (most of the files!) and tell them to sync as "online-only", while dropbox is using all its CPU to sync rather than listen for my commands, so the performance is sluggish. This seems like the same thing the OP was annoyed by. I don't know what else to try other than to fill up my entire disk with dropbox stuff I don't want on this particular machine, then go and push stuff to online-only manually after that pain.

That's not how I want things to work. I want to pull my files out from dropbox on specific machines for specific projects. I don't care whether it's done on the desktop client/finder integration stuff or through dropbox.com webapp, but I need to be able to do that easily or be told the better way to do it.