For many users, setting the number of recent files to display at 0 solves this.
I have the same problem. I found the only way around the issue was to turn the Wi-Fi off on the computer, then no spinning wheels and Indesign works again. But I'd still like to know why. This is hurting my work.
ID is either trying to synch a library or something similar, or access a file on an inaccessible network location.