I just bought Lightroom (so excited!) and am importing my photos. I already have a pretty significant organization of folders on my Mac for all my photos. Does Lightroom recognize all previous folders and I can just move them in bulk or do I need to import them folder by folder? Thanks!
Simply select Pictures or the root folder and in the import dialog choose "Add"
Lightroom does not hold images it will reference the folders and files on your hard drive or connected external hard drive.
Go to the Library menu and put a check-mark against "Show photos in sub folders"