I routinely grant Military Access to nations whose troops are getting in my way. That way their zones of control don't cause my armies to stop moving, which can get old quick.

Ex. In my Scottish campaign, Denmark embarks and disembarks troops around York every single turn. It's annoying as all 'ell. My troops coming down from Iverness to attack the English get stuck in their zones of control. What's worse is that they don't declare war on me, so I can't just smite them.

So I granted them Military Access and now I can bring my troops down without stopping. Who knows what ramifications this has that I overlookeed though.