Have you had experience using GCD for organizing asynchronous tasks in applications?

Yes, I have experience using GCD (Grand Central Dispatch). GCD is a low-level API in iOS for organizing asynchronous and concurrent task execution.

With GCD, you can create queues (serial or concurrent) and dispatch code blocks to be executed on a background thread or the main thread.

Example of usage:

DispatchQueue.global(qos: .background).async {
    // Long background task
    let result = heavyComputation()
    DispatchQueue.main.async {
        // UI update on the main thread
        self.updateUI(with: result)
    }
}

This allows not to block the main thread and improves the responsiveness of the application.