Same. I've making and remaking a bookmarking/notetaking site for my personal use over the years, and this is the solution I landed on. They look like and can be

Same. I've making and remaking a bookmarking/notetaking site for my personal use over the years, and this is the solution I landed on. They look like and can be organized like folders, but you can quickly add items to multiple folders. I think it's working well for me so far.