I know we joke about this light heartedly, and it's almost always included in welcome notes to new members, but there is no such thing as over emphasizing the importance of this, and it's good that it keeps coming up.
Had my first two and a half years ago at age 56. They found and removed one 5mm polyp, and told me to schedule another in 4 years.
Did not find the prep or the procedure to be particularly grueling. I'd do another tomorrow with no apprehension.