I've been using Slack as my primary work communication tool for over five years and have discovered numerous features that significantly improve productivity. The "Hit return without sending" feature allows users to create line breaks without accidentally sending messages, while the "Set a notification schedule" feature enables users to control when they receive notifications, reducing distractions. The "Exclude busy channels from search results" feature helps users quickly find relevant information by excluding noisy channels from search results. The "Remind yourself (and others) to do things" feature enables users to set reminders for tasks and events, ensuring they stay on track. Finally, the "Organize important info in a Slack Canvas" feature allows users to create easily accessible resources and collaborate with team members. By leveraging these features, users can streamline their communications and increase productivity.