Yes, I've had much practice in focus meditation and can attest to this. Sitting in one spot and earnestly focusing on an object of meditation for 15-30 minutes is harder than it sounds.

As powerful as that is (and backed by science), still I wonder about an alternative meditation that focuses on fullness or activity of thought.

But I subscribe to a materialist metaphysics that assumes the mind cannot truly be escaped and the benefit of meditation is to strengthen the mind and body.