Isn't estate planning only for wealthy people?
The short answer is no. Estate planning is not only about money. It involves making decisions regarding healthcare and financial matters, such as writing checks, if you are disabled, as well.
As mentioned in other answers, if you are a Colorado resident, the the State of Colorado does have a plan for you if you do not have a will or trust. It may not be what you want, but there is a plan. It is set out in the Colorado statutes. If you do not have a medical or financial power of attorney, then the court may appoint a conservator or a guardian to help you with your decision-making. None of these are very good options. Whether you are flush with money or not you should be proactive and document your own wishes, regarding health and financial issues.