How important is ritual to psychological well being?

We all think of ourselves as rational beings with no need for tradition or ritual, but we have parts of our lives that have become ritualized. We get up at a certain time, eat at certain times, commute at certain times and go to work at regular times. Many attend regular religious services once a week or visit grave sites yearly. We still have a few holidays that we celebrate regularly. Some of this works for pragmatic reasons. By having certain things done at regular intervals, it provides a framework for us to operate in.

How important is ritual and regularity to our well being? Do we need a degree of certainty in our lives? Would we be better off with a little bit more of it? I am of the opinion that much of the anxiety of our lives is due to insufficient regularity. Change, novelty and choice are good to have but there can be too much of a good thing.