When you have experience, the planning itself doesn't take very long. Once you have good people, plans would help them to do better work. By definition, all we had were good people. Until they started to plan, the quality of their code was irrelevant. Nobody thought they did good work.
Creativity is the same story.
If you consider cleaning up sloppy code a creative endeavor, I'm surprised you have the time to read this column. You can expect to be fully employed at least until your spouse leaves you, you have a health breakdown, or your company goes out of business. Crisis schedules and unplanned projects often fail, not because the work was technically unsound but because the management was so bad. Without planning, you have poor management and with poor management you cannot be consistently creative. Planning, in fact, actually helps creativity.