Can there be too much routine?

I'm approaching my new stay-at-home status with the same organization as my old work status; I'm keeping a to-do list, daily schedule, and even alarm time. My days are split into a morning activity (playgroup, music class, story time), mid-day nap, and afternoon dog walk, singing/stories and play time. I'm attempting a Montessori-inspired work time for the afternoon play and using a whole load of blogs and websites to come up with "works" based around R's interests. B comes home and we have dinner, bath, milk (with Elmo clips on YouTube) and bed.

I appreciate a routine, and I've read repeatedly that children thrive with structure, but I'm concerned I may be taking it too far. I like knowing what we are doing each hour and I have come to realize a unscheduled day scares the living crap out of me. The anal me taking control and I'm not convinced I like this me.