SproutVideo has a Multi-File Uploader. This means that you can queue up several videos at a time to be uploaded. The uploader will work through the queue one video at a time until it has uploaded all of them. Uploading one video at a time is better because it allows you to play your videos online sooner as opposed to having to wait for the whole batch to upload before being able to watch any of them.
You can click "Choose videos to upload", or simply drag and drop your videos onto the page. The upload will start automatically.