Is a conference planning checklist a sheer waste of time?

I considered preparing checklists etc. as a waste of time as I believed in doing all the work step by step and thus thought that nothing can be left out. It was when I forgot to reconfirm the speaker’s attendance for our product launch, that I realized the benefits of preparing a Conference Planning Checklist. Now I just put a tick mark against all completed work and leave a blank against something which is not yet done. This helps me in avoiding last minute rush and plan all my conferences and seminars in the most flawless manner. It in fact acts as my personal assistant in reminding me all the work that is to be done.