Greetings..
My own experience leads me to believe that meditation, ultimately, is designed to bypass prejudicial thought processes and see the experiences as they are.. One of the more profound aspects of Taiji is its training in movement without thought.. we practice repetitively until we no longer need to think about the form, we simply experience it.. hopefully, we can move that "stillness in motion" to our everyday lives, and begin to experience life without the deceptive prejudices..
Although visualizations, chantings, forms, etc.. may serve to initiate some quality of meditation, they are not meditation itself.. they are only tools to help us get there.. too many people get trapped in tools stage and miss the purity of "no mind" (no preconceptions).. in the "be here now" scenario, thought is what separates us from the present experience.. while considering the previous experience the one actually unfolding in the present is unnoticed or lacking our full attention..
So, if the goal (as i see it) is to live a meditative life, shrines and special times of meditation may actually distance us from that goal.. or, may just be a temporary path toward that goal.. the wisdom is to be certain of the goal..
Be well...
TaiChiBob.. "the teacher that is not also a student is neither"