Different needs, different tools. rclone is an option. I don't find it particularly complex but that depends on the user. If you need document type conversion

Different needs, different tools. rclone is an option. I don't find it particularly complex but that depends on the user. If you need document type conversion it doesn't do that. I'm not aware of any limitations regarding big transfers -- I've used rclone to move terrabytes of video files with no problems. It copies incrementally and can retry/restart failed transfers. Google Drive has a daily transfer limit, maybe that's what you mean, but that's not a limitation of rclone.